ummmm... well i suggest you go instore and look (and listen) to some of the ones setup. get some model numbers and prices from there. then go on internet and see if you can get better prices. as for model numbers, i can't say much as i haven't really looked into buying one as the one i have now suites me just fine. but price/feature wise, i love what pioneer packs into their receivers.
But to get the new bluray sound formats, you're going to need a 7.1 reciever. here is a pioneer
and an onkyo
but as for if they sound any good, i can't say. that's really personal preference once you get it set up properly.