And Johnny Lee Miller. You really can't sense they're not Americans. I feel like Ed talks too cryptic in GG, I don't know if that's just how they wanted Chuck to talk or if that's just how he can talk without his English accent. Kevin has a little of that too[not the same, but he has a...way to say things]. And Stephen, his southern accent is good.So is Ryan's.

Also Hugh but he'll have more pics than her so..

He's so good! I was shocked when I found out he was British.
So did the makers of House MD. I heard that when they were looking for someone who'd play the part of House, they were looking for a typical American guy and then Hugh came along and they were like: He's the perfect American!
And then sombody said: Well, he's actually British. ;P

Hugh Laurie man! Have you heard his British accent it's proper British and his American accent is just perfection!

Anna Torv is brill as well though you can't hear any hint of her Australian accent on the show.

I'd have to say Kevin McKidd next - although you can occasionally hear hints of his accent.

Ed Westwick however is really bad in my opinion. I can always hear his british accent.

Ed is really good :)

Then , Kevin and Alex are good too :)

I sincerely believed Hugh was american until one of my friends told me. I've seen very few episodes of House, but I find his accent very convincing.

Even though I saw him in British shows prior to House, it's always a shock when I hear his English accent in interviews.