Let the hive mind of Engadget get that for you.
"I'm in the market for a new phone and money isn't a limitation. I'm also not partial to any particular US carrier, but here are some of the features I'd like to have: WiFi, GPS, good coverage in lots of places, push Gmail (a must!), physical keyboard (a must!), a touchscreen, decent battery life and a relatively slim body. And please, nothing that has a fruit logo on it. No offense to the fruit fans, though. Thanks!"
Ummm, no they're not. They are both GSM an unlocked AT&T phone will work just fine on Cingular, T-mobile or any other GMS carrier for that matter. You're a Cingular agent, eh? No wonder agents get such a bad rap.