Best Sounding used amplifier under 1000???


Looking to get into a used 2 or 3 channel power amplifier to power my Paradigm Studio Reference 80 ver. 1 speakers. Looking at around 200-250 watts per channel or such. I am currently using a Xtant 3300c (60x2, 360x1) high end car amplifier and it sounds so wonderfull but looking to get into more power and with possibly better overall sound (how much more better will it be I dont know?). I'm using Monster Cable M Series CX-4 Bi-wire cable for the speakers. My limit is $1000 used for the amplifier. Please post any comments and suggestions retaining to this idea.

Thanks!
asi_tek
What is the difference between the 12ax7 and the mullard CV4004 tubes???

I have a mint condition Browning Mark 4A CB radio from the 70's that uses 12ax7's and was wondering if Mullard CV4004's would be a replacement or any better????

And maybe I'll get the Rogue 88... but I'm still looking around!

Thanks for the comments and keep them coming!!!
I've heard all of these and can say without a doubt the McCormack DNA 0.5 deluxe can be had for that $$$ used and you will never look back.
The Mullard CV4004 is a Military grade version of the 12AX7. It sounds better than stock tubes but costs about 5X as much.... They go for about $50 each.
Best amp I ever owned is a used Electrocompaniet AW 100. Forget what I paid, but it was under a grand. It's an oldie, but will seemingly last forever. Beats my prior Muse 100, Classe CA 100, Classe 70, Adcoms, B&K and Parasound HCA-750A.
The CJ amps are nice. You could also pick up a used Adcom for $200 to $500 depending on how much power you need, and send it to Stan Warren for modification.