The talk about Sydal VS London earlier is interesting to me, because I've been watching a lot of London in ROH lately and I'd really forgotten how good he was. As much as I like Sydal I think I still prefer London at his best over Matt. These days though I'd probably put Sydal closer to my top 5 because of the different styles they wrestle... while I still enjoy London wrestling toned down, I do miss being able to see him going all out in ROH.
My top 5 in the US, and this is just based on personal preference, would go something like Necro Butcher, Bryan Danielson, Fit Finlay, Super Dragon, and William Regal. Super Dragon I haven't seen since he's returned from injury but I'm giving him the benefit of the doubt. If I had to sub him out though it'd probably be between Sydal and Generico for the 5th spot.