I had an Elite receiver (VSX-43TX) before getting my 990 and five M2200s. I tried out the Elite as a pre/pro with the monoblocks and then I put the 990 with the amps. There was a big improvement with the Elite combined with separate amps over the internal Elite amp section but the M2200s with the 990 was so much better than the Elite alone or the Elite with the monoblocks I knew the Elite was headed to eBay. Now, the 43TX is not the 84TX but I'm betting your 990/7700 will smoke the 84TX or the 84TX with the 7700. I'd look for another way to switch HDMI sources versus replacing the 990 with an Elite receiver. Just my two cents.

Oh, I returned the M2200s and just before the Outlaw 7500 came out I got a great deal on the ATI 2005 which is essentially the same as the 7500.