rA = EvDO Rev. A (faster than standard EvDO Rev 0)
EV = EvDO (Rev 0)
1X = 1xRTT
Now that we've gotten that out of the way, I'm using PRL 40050 which can be found on here:
http://www.the-answerman.com/sidlist/prl/index.asp
40051 causes me to go into digital roam when I'm at home, 40050 picks the right towers (for me) and I'm at full bars.