I use corporate sync to sync with an exchange server with stock rom that came with the phone. Does all the roms allow to setup exchange sync. This is one feature I'd like to keep if possible.
I rooted my phone with z4mod and also have the latest version of rom manager, also bought it to get premium features and also have the latest clockworkmod.
As I understand it, it's best to wipe system and data before installing the rom. I have been watching youtube videos on this stuff to further educate myself.