It would be pretty mad to get such a phone and live with the dreaded "E" when not around wifi.
That said, a co-worker has a T-Mobile Nexus One on AT&T and he gets by, but as many of you may know, Big Blue's flavor is hard to come by.
I do suspect the stateside SGSII, no matter the carrier, is going to be closer to $500USD instead of the $700+ you'd pay for importing.
I'm going to hold out for a TMOUS version and pay full price.
Google Galaxy Nexus GSM Black 2000MAh
HTC One V / "Primo" GSM - Ninja Tel DEF CON XX Exclusive
Google Nexus S / GT-I9020T
"Day One" Google Nexus One / "Passion"
MotoFone F3 / "Zombie Apocalypse Phone"
Apple "new" iPad 64gb WiFi
HTC Wing / "Herald"
(formerly owned) - Apple iPad 2 64GB WiFi Viewsonic G Tablet / "Harmony", LG-P999 / G2X, Apple iPad 16GB 3G, TMOUS1024 HD2/Leo 1024, 4xHTC G1/Dream, HTC MDA/Wizard, HTC SDA/Tornado, Nokia N900, Nokia 6600, Danger Hiptop, Hiptop Color.