2 channel home theatre

If your system sounds good to you for 2 channel music listening then it should be fine for HT as well. The only real gain, in my opinion, would be the addition of subwoofer for the .1 effects channel that never seems to be quite right without a dedicated subwoofer especially from a blu-ray disk. As for a home theater processer, I can't see how spending a ton of money would really make a significant difference. The Audyssey stuff wouldn't be nearly as important with a 2.1 setup as it is with five or more channels, again my opinion.

Something similar to the Integra DHC-40.2 ($1,200 retail) should be more than adequate for a 2.1 setup.

Another interesting solution might be the Denon S-5BD (retail $1,800) that is a receiver/blu-ray player that you might be able to "cheat" a bit and use the front high pre-outs to to run into your existing amplifier and let Audyssey correct it to be the only speakers, other than the subwoofer, connected. It might be possible to essentially use the pre-outs as a HT bypass, but I'd confirm with Denon before making a purchase. The price is a little above your stated price range, but it was be two components if you don't already have a blu-ray player.

My home theater setup is an Integra 50.1 reciever with the Focal 836v mains, Martin Logan Dynamo 700 subwoofer and a pair of Infinity TSS-800 surrounds. The rear channel speakers are pathetic compared to my Focals and I don't use a center channel (I sold my Bose to a co-worker because it degraded the sound compared to the Focals) and my home theater sounds really good. I think anyone that's not an audio snob would approve. Don't spend big money on rear channel speakers, it doesn't take audiophile speakers for surround sound unless you want to get into multi channel SACD audio type of stuff.

I'm sure my Focals could sound a little better using a dedicated 2 channel amplifier, but life's a compromise. My room acoustics are very different from the store that I purchased them from and I actually like the sound at my house better overall compared to what I heard at the store hooked to equipment worth many times (i.e. speaker wires worth several times my entire system) what I have. There were certainly some sonic improvements in the store, but overall the room makes more of a difference for me.

p.s. I don't think there are speakers designed for HT beyond being small. Speakers are speakers.