my understanding was that the 7500's amp design was slightly superior to the 2200's. I own both.
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Outlaw 990 PreAmp
Outlaw 7500 5 Channel Amp
Two Outlaw 2200 M-Block Amps - for the Surrounds
Oppo OPPO DV-981
Polk LSi15 Fronts
Polk LSiC Center
Polk LSi9 Surrounds
SVS PC-Plus 20-39 (newest addition down to 16hz) Subwoofer
Sony KDF-50WE655 50" LCD