I read that pretty much all current HTC GSM devices from Europe and Asia do indeed work on American 3G networks. For the longest time we were tricked into thinking the HTC Touch HD only worked on American Edge networks. However, a recent document released by HTC proves that it does have support for American 3G bands. I am waiting for the HTC hero to come out for ORANGE. At which point I will drop the big bucks to get it early.
Sony Google TV (NSZ-GT1)
AT&T Samsung Galaxy S3: CM10.1 Nightlies
AT&T Samsung Galaxy Note: CM10 stable
Asus Transformer Prime: CM10 Nightly
iPhone 4: Stock
Motorola Atrix: Cracked screen + MIUI