None, unless your ONLY real concern is HT. I have been through a bunch of multi-channel amps in hopes that I would find one that does a very good job in 2-channel and a decent job in HT/multi-channel. These include Krell 1500, Proceed, Conrad Johnson and the "highly acclaimed/reviewed" Theta Dreadnaught II. None of them could compare to a two channel or mono amp for 2-channel reproduction, even 2 channel amps at a fraction of the multi channel amps pricing.
I appreciate your goals and objectives with space and cost, but trust me if you really listen to 2-channel music, you will never be satisfied with a 5-7 multi channel amp. This being said, spend $2000-$2,500 on a good used 2-channel and the balance on a 3 channel amp. Hide the 3-channel amp behind the speakers or someplace and use a remote turn-on tied to your DVD player.
I appreciate your goals and objectives with space and cost, but trust me if you really listen to 2-channel music, you will never be satisfied with a 5-7 multi channel amp. This being said, spend $2000-$2,500 on a good used 2-channel and the balance on a 3 channel amp. Hide the 3-channel amp behind the speakers or someplace and use a remote turn-on tied to your DVD player.