Skirmisher's Sabre - Warrior has high synergy with the attack speed granted by Statikk Shiv. This makes your burst all the more deadly.

Berserker's Greaves I would rarely take these out if I were you. They provide even more attack speed on top of Statikk Shiv which will be needed to perform lightning fast kills. Unless you are dying a lot and need to trade them out for Mercury's Treads or Ninja Tabi then stick to these.

B. F. Sword Generally as I stack up my Poacher's Dirk, I will have enough extra gold from kills / monsters to buy an Infinity Edge. This sword is an early boost to your ganking potential and can be used for that Infinity Edge or be saved for your Duskblade of Draktharr.

Poacher's Dirk This has been a great addition to Shaco's arsenal. It saves you a good amount of gold and earns you extra gold from the monster kills. I've been able to build Infinity Edge and Duskblade of Draktharr while holding this item.

Infinity Edge When you buy this, it is really the beginning of your landslide of huge damage. The unique passive makes your Backstab all the more deadly and throwing in a Statikk Shiv can add in more sustained critical damage.

Statikk Shiv Like said, try and buy this after Infinity Edge to make your crits hurt bad. However if your Poacher's Dirk is fully stacked and you can't afford an Infinity Edge then just purchase the Statikk Shiv First. Statikk Shiv throws in attack speed with painful aa's derived of your former items.

Duskblade of Draktharr This item is a HUGE necessity for Shaco and by all means cannot be replaced. With Shaco's Deceive providing stealth, your Backstab crit gaining the 50% additional damage along with the +200% Lethality will basicaly 1 shot any squishy targets.

Ignite Is not usually taken in replacement of Flash though it works very well with Shaco. Many of times, he will require a bit extra damage to finish off a target, which can be done with his Two-Shiv Poison and Ignite.

Smite Is too obvious.

Fervor of Battle As this build adds on a lot of attack speed, your auto attacks can throw on stacks quite quickly maximizing your damage in the quick 1v1 fights you can pull off with Shaco.

Warlord's Bloodlust Can be taken as well if you'd rather have a bit extra sustain with the sacrifice of some of your burst potential.

1. Greater Quintessence of Attack Speed:
Attack Speed is a big part of this build and the bit of extra attack speed can certainly help.

2. Greater Mark of Attack Damage:
As attack speed is important, making every one of your aa's hurt is a necessity.

3. Greater Seal of Armor:
Protection against ADs.

4. Greater Glyph of Magic Resist:
Protection against APs.