currently using a Marantz SR6005 as the pre for my HT system ( using it to power the sides and rears of my 7.2 system). I'm deliberating on do I replace it with another receiver, or go to a pure preamp. If I go with a pre, I could use some advice on which one.... If it helps, I'm using KEF Reference 5 speakers for the fronts and a 4C for the center. And a Krell S1500 to bi-amp all three. Have a Sunfire 5 x 200 that I can use for the sides and rears if I go pre... your thoughts would be appreciated. Marantz? Emotiva? Macintosh?