In 2007, after my MDA 3 touchscreen broke for a second time, I bought an O2 XDA Orbit, originally named HTC Artemis. Being slower than the MDA 3, it has longer battery time in return, and most of all, an internal GPS unit which I had longed for. It is also very lightweight in comparison.
Currently, I would buy an HTC Trinity instead, because it has 400 Mhz and all features of the XDA Orbit. It is about 1mm thicker, though, and does not have the extremely cool scroll wheel.
|O2 XDA Orbit
Despite the nasty bugs, I like the XDA Orbit more than any PPC phone before; for the first time, the functionality to size ratio seems to be just right.