If you shelled out 600 clams for an unlocked Nexus S, buyer's remorse starts now: the subsidized AT&T version is out today. Available exclusively from Best Buy (and exclusively in black), the AT&T Nexus S will set you back only a paltry $99 with a two-year contract. Is the loss of color choice (and that whole "SIM-locked to AT&T" thing) worth the savings? We'll leave that up to you and your
