I personally prefer JBL amps to RF. I've owned both, had some problems with the RF amps. I think their old school stuff is much better than the new line their pushing in the chain stores nowadays. They're not as solid or bullet-proof as they used to be.

On a side note, I've never seen new RF amps for less than JBL. Is it remanufactured or what? I got my JBL 80.2 for $100...from a licensed seller (full warranty). Their's alot of different online stores that carry them, so my best advice would be to find the absolute cheapest and then go to someplace like Sounddomain, who will beat the price for you. Plus, then you have the peace of mind of buying from a solid and dependable company.