If your going to add and amp, I would look for at least a 3ch amp. That way all 3 front speakers will at least be driven by the same amp and have the same tonal quality.

Check out www.audioadvisor.com They are running sales on a lot of amps right now.
The NAD T955 100wpcx5 is on sale for $799 $1500 list!

If you can swing some extra money, they have the Parasound Halo A52 125wpcx5 for $1720, it is a demo unit which I would not hesitate to buy.

Also consider Van Alstine's 3ch solid state amp http://www.avahifi.com/root/equipmen...ight_240_3.htm

His equipment is well made, they have an excellent reputation and he will upgrade your equipment if he comes out with a new model. I own some of his gear and have heard that amp. Nice warm sound with tremendous bass.