I think you should just leave ATT. There are only 2 good Android phones with keyboards so far, the Droid on Verizon, and the upcoming Mytouch Slide for Tmo.
Tbh, it seems like manufacturers are doing away with keyboards and focusing solely on touch solutions, like the innovative Swype input. However there is 1 phone that no one knows who will get, and thats the Motorola Shadow, which has a 4.3" screen w/ keyboard and hdmi.
Edit: Judging from the info on this site, the Motorola Shadow WILL be compatible with ATT 3G. This might be your holy grail. But unfortunately there's no word on its release.
