best sub $1000 amp to mate with tube preamp

Look into a used Van Alstine 450ex or 550ex.

Do a Bryston 4B-ST for $1,100 or so. They are very well made and sound better than most amps at that price point. In addition, you'll easily be able to resell a Bryston should you need to due to the twenty-year transferrible warranty (perhaps even at a profit). I had a friend who ran one on Aerial 5's (small monitors) and it sounded superb.

I have really been enjoying my ARC SP-9MKII/PS Audio HCA-2 combination. You could contact PS Audio to inquire about the impedence match with your pre.

well, looked at the bryston and heard several comments about roughness and a bit bright in treble that bothered me. van alstine's website is impressive and the few reviews i could find were positive, would like a little more comparison of it to similar products. nobody has bitten on the parasound, figured there were some fans out there. will look into the ps audio. my goals are good image depth without glare