FULL AD BUILD
[*] Getting straight into it
From there you build IE then Zeal into a Phantom Dancer:
IE ZEAL PHANTOM dancer
Finish off with a Bloodthirster or if you are getting focused to much and having a hard time staying alive in teamfights you can go for GA
It's not necessary for 2 PD's on varus due to his passive adding 40% AS, but It doesnt mean you cant replace Berserkers Grieves with a PD late game.
I run 21/1/8 putting a point into Summoners resolve in the defense tree for the extra 10% increased summoner heal.
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I run Flash and summoner heal works very well you are able to make big plays usually and able to come out alive with heal.
Using the build above you will be able to dish out massive amounts of damage and taking advantage of blight and his passive make sure to land you acquire blue buff when laning phase is over to maximize your poke before teamfights as your Q can get up to 700 AD.
I didnt include Tri-force as one of the items to build because im still testing it, but if you feel comfortable enough to throw it in the lineup go ahead. :) enjoy
Pros / Cons
Pros: very high ad ratios on his Q take advantage of that skill its like a nidalee spear and ezreal ult combined
cons: very slow even slower when Q is activated; squishy as is any ad carry