This is IMPORTANT to bear in mind about the Galaxy S II:
The international version might run the lightning-fast in-house Exynos CPU, which seems a bit faster than the Tegra 2. However, the US version of the GSII might very well have the same CPU the G2x has, the Tegra 2. Google it.
That said, the GS2 will likely have similar hardware specs, probably a little more RAM, and a LOT more crapware piled on top.
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.