It looks like your current Marantz has 2.1 channel preouts so I would suggest going with a stereo integrated with a home theater bypass. This would allow you to connect your audiophile approved source directly to the integrated and bypass the home theater gear all together. The integrated would then function as a power amp for home theater.
I really like the Krell S-300i but it would take your entire budget. I have been out of the market for a while so don't have a specific product to recommend.
I really like the Krell S-300i but it would take your entire budget. I have been out of the market for a while so don't have a specific product to recommend.