Any 5.1, 6.1 or 7.1 channel HT receiver that has pre-outs for (at least) the front L&R or all channels, will work. I've used a similar setup on numerous occassions, letting the HT receiver provide all of the processing and powering the center and surround channels.
You can get a decent HT reciever with pre-outs for as little as about $399 new. I've owned the Pioneer VSX-1015, VSX-1016 and Sony STR-DA4ES and STR-DA5000ES, plus several more expensive ones. I would go with one of the lesser expensive models as long as they had pre-outs and met any of your other needs. I'm currently in the market again and I'm considering the Onkyo 703 or 704.
Enjoy,
TIC
You can get a decent HT reciever with pre-outs for as little as about $399 new. I've owned the Pioneer VSX-1015, VSX-1016 and Sony STR-DA4ES and STR-DA5000ES, plus several more expensive ones. I would go with one of the lesser expensive models as long as they had pre-outs and met any of your other needs. I'm currently in the market again and I'm considering the Onkyo 703 or 704.
Enjoy,
TIC