There was a time when my answer might have been, separates for sure. But, technology increases and gets better. So, with that said, there are many good choices out there. My recommendation for you would be a receiver. Receivers always seem to be the first with all the codecs, inputs and outputs that you need. Thus, you can start rolling right away with the latest innovations. Most are THX certified, and in my book, I think that is important because a certain standard has been set.
Next, I guess would be, who? While there are many good choices out there, I would recommend Onkyo. Not just because all the reviews for the most part are positive, I helped to install one w/a friend, along with a 50 inch Pioneer Kuro Plasma, and till this day its working great.
Listen, check this link, I hope it will help you!http://www.hometheaterreview.com/eq...certified_seven_channel_av_receiver001163.php