I've considered the CFR's as well, and the Rinehart 4" too.
I can't speak from personal experience, but from I gather from all the reading I've done, the CFR's sound great, but the baffles in them are too big, resulting in little to no back pressure, and therefore a loss in torque. Also, people say they are hard to tune. Mind you, you might not notice much of a loss considering the set up your running now- no offence to your exhaust, but like you say, yours is geared more to mid-high rpm power than low end torque.
Believe me, if I thought that wasn't the case, I'd have a set of CFR's by now. I'm probably gonna stick with my 2.25" Fullsac cores, until I hear a bike in person with pipes I like, that don't lose power. I love great sounding pipes as much as the next guy, but I dont' want to sacrifice power/torque for a better sound.
As far as where to buy CFR's, I'd post a "Want to Buy" thread in the Classifieds here, and at hdforums- There always seem to be guys that are ready to ditch them. If you want new, try Dr V-Twin or Phats Performance.