Red: If you will be mostly want to use your phone in the US, then the best bet will be Wizard (Tmobile MDA or Cingular 8125). The other one which is Universal (xda exec, Jasjar, Tmobile MDA Pro) is little too big for the phone. I do own both the Universal and Wizard, and of course I love the Universal which is simply amazing, but now I don't use it as a phone but more as GPS Navigation, and others stuff. But Wizard is pretty good as well. There are quite a few tweaks that you can do to all these HTC phones and if you decide to get one of these let me know and I will be happy to help.