Bluewaxx - unless you just came up with 803 matrix s2 because of an ad, you must have heard them and liked them. Alot of people did. They are very highly rated speakers one of the best in the matrix line for what one paid for. 804's were the exception. I have 803's and 805's in my HT setup and 801's in my 2 ch sound room. Many consider the matrix line B&W 's finest. If these speakers are in greast shape and a decent price... well the choice is yours. I also own cdm1's. I would stick to the 800's series if you can. And yes an amplifier rated at least close their maximum rating is recommended.