Is there a reason you don't want to get a receiver? It makes it super nice because it gives you more HDMI inputs, and you only run one HDMI cable to the TV and everything else to the receiver. Better quality sound as well, if you get a good receiver and speakers.
I'm running a fairly nice Sony receiver (STR-DH810) and the Andrew Jones designed Pioneer speakers. You can't beat those speakers for the price. They sound awesome. Here's a link to the review by Audioholics:
http://www.audioholics.com/tower-speaker-reviews/pioneer-sp-pk52fs
If you are looking to spend $500-700, a receiver + good speakers is going to give you the best quality sound, bar none. I'm not talking about "home theatre in a box" systems; you need a true receiver and good quality speakers.
I'm very happy I went that route.