First off, the Galxy S is really a family of phones,
The AT&T Captivate is a Galaxy S without the front camera.
Verizon’s Fascinate is a Galaxy S that trades the front camera for a camera flash
Cellular South and US Cellular have the Showcase and the Mesmerize respectively.
Sprint’s Epic 4G is also in the family
Okay, not that that is out of the way, it really is hard to say without knowing what you want. Personally, I don’t give a shit about front-facing cameras since I do my chatting face-to-face. My laptop has a camera that allows me to video-chat and I have never used it.
I don’t text either, so a QWERTY keyboard is not a necessity for me; IMO, the Swype™ on-screen keyboard is better anyways.
I have largish hands and find many phones to be too small. Even the iPhone is a tad baby-ish to me.
You want something with good enough specs to handle Gingerbread when it hits, so many of the current Android phones are out if you are worried about obsolescence.
AT&T has an unreliable network with spotty coverage and shitty customer service, so any AT&T-exclusive phone is out.
For me, the Droid X was a no-brainer. Many complain that it is too big, so it fits my hands perfectly. Many people are forced to choose between a phone that is too big or a screen that is too small. You can’t fit a 17” screen in your pocket! It is a touch-screen phone; no QWERTY. It only has the normal camera on the back, so I am not paying extra for something I don’t want. It is high enough on the food chain to handle Gingerbread, so it won;t be obsolete for a while.