Wirelessly posted (HTC Diamond: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 7.11) Sprint MP6950SP)
lol
Well, I guess it depends on what kind of coverage t-mobile has where you want to use your device.
If they have coverage where you want it and a decent plan then I say go for the HD2.

If not well do like me and wait to see what is yet to come.