This is my first build and only how |I| play Master Yi.
First, my end of the game score is usually 20-40 kills and 5-10 deaths. I DO mess around a lot, though. To me, using Master Yi is pretty simple and therefore I stop taking the game seriously when my team is winning.
Second, if you can't tell by the stats, this build makes you very, VERY fast. You can pretty much 1v1 and win against almost anyone and sometimes even 1v2 (depending on who you're against).
Third, and last, the word tank will mean nothing more than "Oh hey, time to use my ultimate" to you after your first Phantom Dancer.
Right, moving on to the details.

I will keep this section very short and sweet seeing as how it doesn't need to be any other way.
My runes are setup to where your critical strike damage does a LOT more for you, and you have a nice armor penetration value. I find that this works VERY well for beginning through end game. If you want an even more early on advantage go with Glyphs of Strength, but keep in mind that it's ONLY (yes.. I said only and it's in caps but that's because:) for early game and will do you little to no good later in the game.

I find myself staying alive after First Blood through Vampiric Scepter quite oftem. It's a HUGE life saver and therefore recommended as your first item by none other than ME. You can generally stay in a lane for a bit longer than other people because of it as well. You'll find yourself nicely leveled and have quite a nice amount of gold. I generally go back for my first time at level 6 or 7 (depending on who I'm laning against and how well they're doing) and being able to grab myself Wriggle's Lantern and maybe even Berserker's Greaves. If I'm not able to grab Berserker's Greaves, I get a Dagger to start the build for it. Once I get Berserker's Greaves, I remain in my lane doing little to no ganking. I ward bushes close to me with Wriggle's Lantern to prevent as much ganking as possible. This will help SO much. The reason behind that is simple: I need to get money as quickly as possible and Wriggle's Lantern helps me do that. If I can remain in my lane for a long while (long enough to get 1650 for a B.F. Sword), then I know I'm on the right track. I go back as soon as I have enough money for a B.F. Sword. Once I get that, I start ganking if needed. If it's not needed, I remain in my lane and proceed to farm. The second I can, I get my Cloak of Agility. This provides me with more critical strike chance causing more damage and a huge scare when it hits. I can generally hold off my enemies for quite a while and still farm. If I'm doing well, I hold off on my Infinity Edge until I can get a Zeal and then get them both at the same time. The Infinity Edge gives a 250% critical strike damage along with the 10.06% from the Furor Runes. The Zeal provides a with more attack speed, movement speed, and critical strike chance. By this time, I'm soloing Dragon, ganking more often, and still farming. Once I get my first Phantom Dancer my team is often ready to Baron and if they aren't, I solo it. Farm, gank, and jungle to get your second Phantom Dancer quickly. Usually, the game is over after your second Phantom Dancer, but if not, get your Black Cleaver and later replace Wriggle's Lantern with a Blood Thirster.

Recommended:
Flash
Exhaust
Reasons:
Flash is WONDERFUL for a quick jump to get your 'Q' off and get that last hit or just get closer quicker. It's also awesome early game to make a quick escape or quick kills. I (and this my personal opinion) wouldn't give Flash up for anything.
Exhaust is a great skill to help you get closer quicker if your Ultimate is up. I often find myself saving my teammates with this rather than using it for my personal benifit, though.
NOT Recommended and Reasons:
Clarivoyance - No. Just no. It will do you no good because you'll have Wriggle's Lantern
Ignite - Useful later in the game, but not necessary. It may land you a kill here and there, but you won't be able to save your teammates with it. And being the carry you are, you want to keep your allies alive to take the damage for you! :D
Revive - Another No. Period.
Clarity - You don't need much mana, but if you do, simply get Blue.
Ghost - Your Ultimate is bossly. The end.
Smite - Good if you're jungling, but not needed otherwise.
Cleanse - It could save your life if you were ignited, but that's what life steal if for.
Fortify - RUN FOR THE TURRET! You're Master Yi - You can get there quick enough. :P. So that's a no.
Heal - Life steal, remember?
Rally - I don't see this helping you very often, so I'm going to have to say no.
Teleport - Good if you don't have Flash yet, but still, YOU'RE FAST AS LIGHTNING!

Thank you for taking the time to look at my build. I hope this helps you all. You'll never see me without this build if I'm Yi.

Sincerely,
DjAmplitude
(soundcloud.com/djamplitude)

Pros:
Super fast (both movement speed and attack speed)
You're painful
People will RUN from you
You get a good laugh from watching the enemies health
You can solo Baron
Good from Early to End
Cons:
Pretty squishy