i pick Greater mark of Desolation because at early game you need do the most possible damage, and Armor penetration its a good duo with damage. and Shaco has naturally daamge.
i pick Greater seal of Alacrity because Attack speed + damage is a nice duo.
i pick Greater Glyph Of Alacrity because Attack speed + damage is a nice duo.
i pick Greater Quintessence of Desolation because at early game you need do the most possible damage, and Armor penetration its a good duo with damage. and Shaco has naturally damage.

I buy Dagger and a Health potion at early game because i think movespeed at early game for Shaco is a really good choice because when your enemie is with low health you want move fast for kill him because normally people gets Ghost or Flash and they are useless if you have a lot of movespeed.
i buy the 2 Phantoms because they give you move speed, attack speed and critical change and with infinity edge i get like 82 critical chance.
i buy Infinity edge, Black cleaver and Bloodthister because are damage with critical, armor penetration and Natural damage.

Flash because at Early game Shaco is slow and week and you can use it for Escape or Caught your enemies.
Ignite You can use it for double you focus someone you cast to him ignite and then you fight with the other enemie

I upgrade Two-shiv Poison because Shaco doesnt need so much mana at start, and you can use Two-shiv poison for hurt your enemies and then you can use Deceive and kill your oppenent. i think Jack in the box for Shaco lane is not usefull.

I think all offense masterie is the best for Shaco because he is not a tank and i am not making him jungle so i think are the best choice for Lane Shaco.

On Ranked games Shaco is not so good at lane so try to use Shaco lane in 5v5 normal or 3v3 Normal.

Try to be with a tank or a support with life because when they focus on your teammate you can hit them and do a double kill and if they focus you, your teammate can kill them. but is better if your teammate gets focus.

Pros:
You can kill more fast.
You get more gold.
You can finish the game fast.
You can get fed.
Cons:
You can die very fast.
If you dont kill fast your are useless.

Banshee veil.

A good item for survive a lot of disables