yeah absolutely make sure you only flash CDMA ROMs if you're on sprint. flashing a rom that's intended for a GSM phone will turn it into a paperweight. First you have to HardsSPL the phone using the CDMA TOUCH PRO2/Rhodium unlocker before you can flash custom ROMs. must be the tp2 one in the cdma upgrade section in this forum:
http://forum.ppcgeeks.com/showthread.php?t=93252
it's really easy, just follow the instructions to unlock. you only need to do it once. then you can easily flash any CDMA ROM at any time
the biggest names for ROMs here seem to be Juicy, NRG, and Mighty. You'll have to try them each out to figure out which suits you better cause osme are faster and some have more goodies than others
have fun, you will probably be flashing a lot once you start...
edit: it's recommended to hard reset your phone before and after flashing. i only do it before though.