Someone else got an 8320 the other day, and I'm not sure I like the trackball, but maybe I'd adjust.
I'm a switcher from 8700 to 8320 aka T-Mobile's Blackberry Curve. It took me just a week to totally get used to the trackball.
I don't want the 8320, because it's the camera I most want to add to my BlackBerry experience rather than Wifi. Also, I can't tell: does the curve come with GPS, or it's just "GPS-ready" or something like that?
8320 has a 2MP camera
AND Wi-Fi but no GPS. I believe AT&T's Blackberry Curve is 8300 and has no Wi-Fi.
I've got an 8700 now, and I like the size. I think they're the same size so I'm good with that.
8320 is slightly smaller overall and significantly thinner and "feels" better than the 8700. It's still all plastic body though. It would have been nice if it adopted some of the iPhone's good looks.