ACR generally does 27% rb by default:
BCP is vip by default but I believe at least at one time you could request it to be changed to rb but it was a one-time change.
Merge is a crappy vip program now anyhow as opposed to rake, bovada doesn't really have anything except exchanging your points you earn for tourny tickets...and sometimes bovada does have weekly bonuses where if you earn so many points you'll get a bonus either $$ or random or something. Not sure about any revolution sites (like juicystakes), or the new evolution (i think) network that has the more recent us friendly site of fullflush and pokerhost (were once on merge).
Some links for the sites mentioned, signing up through cc links if you havn't already got an account on the sites will also gain you access to some great deposit bonuses which are always where its at in regards to getting the best bang for your buck as far as rake is concerned.
Also if you signup through cc for a fullflush account (if you don't already have one) you can also gain access to a 100$ freeroll from this forum that runs there on Monday evenings.