Best bet is to seek advice on AVSforums.
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Denon X3400 (7ch), which can also be had for cheaper as a factory refurb sold by Accessories4Less. There is also the Marantz 6012 (9ch, expandable to 11ch with external 2ch power amp). Unless you need 13ch, no need to spend more than these, they are already good quality (super linear FR, unclipped 4Vrms pre-outs, >90dB SNR, ~2dB of dynamic power over rated RMS wattage, etc.).