$1000 to spend on an amp used

A Parasound 1500A or Rotel 1080 would be good choices. Used prices are about 500 and 750 respectively. Get the Parasound and sell your source and with the extra money get a Marantz SA 8260 or Jolida 100 or whatever you can afford. Do a little research. You'll end up with a better sounding system.

look for a used Coda amp. I feel they are as good as anything out there for 2-3 times the price and with build quality better than anything currently offered by anybody.

Get a conrad johnson mf 2200. 200 watts per channel, nothing sounds better for under $1000, you can get them for about $700-$800, good luck!!!!

I've always liked the Maccormack DNA designs. They also have the benefit of a solid upgrade path through SMC Audio upgrades (Steve Maccormack's new company). Happy listening!

I don't know your speakers, or how much power they like, but I 2nd the advice as to C-J SS amps, or McCormack. Lots of used C-J SS amps, MF2300, 2250, etc. should be under $1K--just do some research on the various models. And McCormack--DNA .5, or 1.0 depending on how much power you need.