I would highly recommend getting a set of Thiel front ends. Either 3 MCS1's (which is what I use for my fronts/center) or a MCS1 for the center and a pair of CS2.4's (or CS2.7's if you're looking new, but the 2.4's are just an amazing value when found lightly used). I'm using my CS2.4's in my 2-ch setup.
I would stick with a very good pre/pro and use the amp you already have. The Marantz AV8801 is a great recommendation.
I would stick with a very good pre/pro and use the amp you already have. The Marantz AV8801 is a great recommendation.