What amp for Thiel cs3.5's?

I'm looking for a SS amp for my 3.5's. I Don't have a lot of money to spend. $500 is about it (I will buy used). Do i need something that's around 200W/ch into 8ohms (must double down into 4 ohms) or should I get something a little smaller of better quality? I would really appreciate any advice.
thanks