Well maybe taking a look in the CDMA ROM upgrade section would be a Good place to start. Mike cooks for the TP2. asking a question like you did is going to give you 1000 different answers and none are going to be the same. The best thing you can do just like your TP is start trying them.
http://forum.ppcgeeks.com/forumdisplay.php?f=98
And there is no WP7 for TP2 it DOES NOT have the hardware to support it.