I am planning an HT for my brother-in-law and we have narrowed down the receiver choice to: Denon 1803 Marantz 6300 HK AVR 3550 At the moment he will be using it with Wharfedale 8.3 fronts, 8.1 surround and Diamond 8 center. These speakers will be replaced later, and he wants to get the Acoustic Research S50 for fronts. Since we cannot audition those receivers, anybody had experience with these receivers driving Wharfedales? (I have a Marantz 5300 driving Acoustic Research S50 and the combination is great). Thanks!