I'd second the opinion to get a single multichannel amp. The Outlaw multichannel amps are all made by ATI in the Los Angles area and have a solid reputation, including the 7125. My ATI amp is virtually the same as the Outlaw 7500 and I couldn't be happier. I had five 2200s for a while and returned them to Outlaw (with very good customer service I might add). With five 2200s you have to deal with five power cords and the amps themselves take up more space. As Kahuna noted there are certain considerations to stacking the 2200s. I'm using 4 ohm speakers all around and Outlaw recommended stacking no more than 3 2200s based upon the speakers sensitivity. So I had a three and two high stack of 2200s that took up too much space. I didn't have the opportunity to do a side-by-side comparison of the sound between the 2200s and my amp.

I think if you get the 990 you will be very pleased with its 2 channel performance and you will be set when you expand into HT. My use of my HT is now dominated by 2 channel music after getting the 990. Its been nice to rediscover music with separates after having a receiver that underperformed on music. There also was a corresponding improvement in 5.1 performance with the 990 versus the receiver. IMO it was well worth the expense and would work for you in both the short and long-term. Enjoy!