I have an RX75 plus waiting to go in, I found an ebay vendor who was willing to take $850 for the complete setup (two front jammers, 1 front receiver, 1 rear jammer/receiver, plus kit with speaker, led, mount kit, etc.)
PM me if you're interested in his info, I should have thoughts on the RX75 plus in ~2 weeks... Its replacing a Blinder M20/Valentine 1 combination.