Question about HD2

[htc-hd2]

Hello

I just got my HD2 from t-mobile. It looks nice. I heard from various people, the original ROM causes some issues. I have to say, the phone froze on me today once. I hear the ROM needs to be re-flashed to fix the issue.

I have few questions:

1. What is the best ROM to flash the phone with?
2. How the SPB shell (5.0 ?) works on this phone?
3. Just read t-mobile is having their phones shipped with Windows Mobile 7. Mine is still at ver. 6.5 . Will there be any issue upgrading the phone to 7?

Thanks