is your friend manager or something @ best buy? otherwise, if hes just an installer or floor salesperson, theres no way in hell hes getting you anything @ cost.
i vomit on best buy stuff cuz for the prices they sell things, you dont get what you pay for - its like a local crutchfield.
RF stuff is good - depending on the model. some kid sold me an RF sub w/o knowing which it was, i forget what model but it was their top of the line DVC sub from a few years ago - i got it for $80 and it was worth over $250. that thing hit so hard....oh yeah! but a 12" is too much bass, annoying as hell. im going with a 10" in my next setup. clean, tight bass ownz me.