The Sprint version of the Galaxy has the slide out keyboard and isn't all that bulky. Maybe compared to the iPhone, but not at all compared to the other Android phones.
The Nexus S is the best phone on the market, but it's a variant of the Galaxy S. It will get all the most up to date software releases first and fastest. You can buy it unlocked and put it on TMobile or ATT if I'm not mistaken.
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