Ditto what Reubent said. I've done the same with great success and my priorities are identical to yours. If I'm you I'd get the Monitor Audio PLC350 as it will probably be the best match for your PL500s short of adding another PL500. For the receiver I'd recommend something like the Yamaha RX-A2060 that should provide decent enough sound quality for HT but doesn't cost so much that it'll be painful to replace when standards, connectivity, etc. inevitably change. Hope this helps and best of luck.
How to merge home theater with 2 channel
I currently have 2 channel but I just purchased a projector and 120" screen. What is the least expensive way to combine home theater with my existing 2 channel. I don't need it to be at the same level as my 2 channel, but I'm assuming I need to match the center channel with my main speakers? My 2 channel system: Jeff Rowland(JR) 625 S2 amp, JR Corus preamp that has home theater bypass, JR Aeris DAC, Bryston BDP2, OPPO BDP-103 Blu-ray player, and Monitor Audio PL500 speakers.