My favorite is still Paci.
Currently, it's DarkStorm overall (including pugs, cws, pubs) and Ice as #2.
I've always been impressed with ice's aggresive and up-tempo tactics, but I think he needs more originality. Frost -> Sac rush and building huge bases are effective, yes, but there are many more methods that can be just as effective. I rarely see him try something else such as a surge rush, a human chemical/ballista rush, new twists to bases ect. I do see him behe rush sometimes and that's what he needs to do more.
Darkstorm, on the other hand, gets my count. The strong point about him is that he can build awesome bases with a minimal amount of stone and not towerspam. That's what true base-building skill is about. However, the one downside about Darkstorm is that he usually doesnt take advantage of being aggresive. Too many times do I say, "Damn DS, you could have clinched the game right there."
I've also been impressed with Frost's human commanding skill. He knows how to be aggresive while being defensive at the same time, and I've learned a lot from him.
And finally, I have to reluctantly mention Java just to boost his ego