I play him top alot and usually roll all over my opponent by the time i've got lvl 2 or 3 E (spin).
I have heard people talking about building Atma's on him, but I have yet to try it. I'm very skeptical since it's nerf.
Brut and a G p/10 item is a must in my book. With those, boots and his E leveled up enough it's farm mode all day long, with the occasional trades. Then I'd get either Phage or Hex, then the other. You can go either Frozen Mallet or Tri force, depending on if you need to be more tankey or not. Then a GA or Warmogs with the same role appropriateness. Sunfire or blood thirster next. Then ghostblade if you haven't finished it already then Maw if you need it.
Pre 7 or so he's pretty gankable, just keep on your toes. I've started to not grab flash because his Q has that "ghost-ish" utility to it.
Hope it helps!