Items

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3 x
A steady start with moveability against ganks, and pots for increased lane sustain.
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Ninja Tabi is great on
Shen, it overalls gives him reduced damage taken and then it comes in cheap prices, making him having a better early game.
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An increased attack speed means more
Ki Strike, an increased health bonus means a stronger
Ki Strike and a stronger heal from
Vorpal Blade. It also has a nice damage bonus + aoe attack every 4 hit means an increased farm and overall damage output.
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This item gives you incredible survivability for the gold it cost, and in it makes you a unstoppable tanky mid game. It boosts your lifesteal and your
Vorpal Blade, and makes the heal of a Support much more effectuve. It also gives more MR against them Burst AP's, and the CDR reduction helps on achieving CDR to reach 40%.
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The item that has it all and benifits
Shen so incredibly much. Most important stats increased: Health and Attack Speed, which both increase Ki Strike frequency and damage and in turn increases the energy recovery. Secondly it gives a slow on hit effect, and a improved version of
Sheen ability trigger. The Increase in AP/AD/Movement Speed/Crit Chance is just overall nice and comfy. It's only at minor drawback of mana gain which doesn't change the fact that the entire item itself is still worth it.
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This is item does not only benefit
Shen in the most obvious way (Health Increase, and AS increase) but also gives CDR (So with runes and masteries and Spirit Visage gives a pretty 40% CDR at lvl 18) and to top it off the item gives a nice AS (as before mentioned) and lifesteal to you and your pals.
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The attack speed is allways beautiful to make a more frequent
Ki Strike, the MR is good and needed cause this Shen is a powerhouse against AD and MR is never underrated, the extra Magic Damage is just perfect icing on the cake.
Other Items:
These items are different but just as useful, sometimes you wanna use these depending on the enemy and need, some are last items others are replacements as described below.
A solid last item for this build if the enemy is kneedeep in AD, show them whos the boss!
A great tanky item to finish off with, if you feel like missing that last MR, and general tankyness.
Really.. There is no kill like overkill... If your stuck in a hole and your the team carry, then either choose one of the above, or try to cut the enemy into little tiny pieces.
Crazy crazy item, really... But expensive, but thats not gonna stop you! This item is more of a replacement too Trinity Force as it kind of takes it spot, i am firm to the rule of not being Tank Shen, and more damage. But hey, i am not you ;)
As a last game item it makes Shen more beefy, a greater chaser, and most important a stronger damage dealer. Get this if everything seems steady and you prefer raw killing power/chaseability over more Armor/Magic Resistance.
Ability Sequence

This entire section is already covered brilliantly by SheaDog's guide The Shank under abilities (A link should be floating around in the Introduction). Though i will give some details on the purpose of your abilities as "Bruiser Shen".
This is your late game bread and butter and how fortunate it's your passive. This passive is cruel and just grows steady in power as the game continues and is what makes this build viable. Lets take a quick look at it, it deals damage equal too 112+10% of
Shen total bonus health(at lvl 18) and thats every 8 second. The cool thing is that these 8 seconds are reduced by 1.5 sec (3 if Feint is up) for each attack made, and that each Ki Strike returns 10-20-30 energy back.
This is your early game bread and butter ability and yes you allways need to max this first, it's harass tool thats just 'over the edge' annoying against the enemy. The heal is great and it what makes
Shen entire lane sustain, i feel like this heal doesn't get enough praise.
This is what you maxes after
Vorpal Blade is maxed. This minimizes damage output on you which is really great against harassment champions, and generally great because of the lack of beefyness. Though the true power comes in when it increases the frequency of your
Ki Strike, and therefore optimizes your damage output.
This is your best utility ability ever, it's what gives you an uncanny edge in 1v1, it gives your team an uncanny edge in teamfights, it makes chasing
Shen uncanny edgy. But if you miss with this ability, it will punish you, the only time Shen is truly weak is when he just failed at using his
Shadow Dash. I would recommend this early on just one time, so your able to survive ganks and make ganks with the jungler so much more effective.
After level 6 when you gain this ability, you won't just be able to hold top lane, you will be able to gank across the map at the same time. Once level 6 keep an eye on your allies health, your not a supportive champion, but if the enemy won't get a kill, they will be easier to take down later. This ability makes
Shen a semi roamer, he got strong ganks, ton of damage, and all around moveability.
The ability sequence is quite simple, max out your
Vorpal Blade, choose
Shadow Dash once at level 2 or 4 and then max out
Feint for maximum lane sustain and engagement. Take
Stand United when possible to change the effect of mid to late game.
Summary

It's a short build, i'm not here to tell you how to play, there are plenty of other guides that details that. This is my try at the new Shen rework since 'Nautilus Patch' his abilities now asks for no more tanking, now it is time for a ninja, now it is time for Shen to finally be a NINJA!
hope you would rate and give a comment on improvements on this guide, useful criticism only.
Thanks GoblinWizardry for testing, screenshots will be up soon.