They are all sold now, the clearance 1200D's gone. All 16 of them. Someone purchased the last 7 all for themself...
I haven't had the AQ1200D on my desk, but I seen plenty of those boards, and because of that I am a pretty good guesser at what's in there. It might make 1200 watts if it's running a little higher rail voltage than the SAZ-1000D, but even with super high rail voltage it's not going to touch the output of the SAE-1200D, even if it used better than IRF640/IRF9640 mosfets on the output, which to my knowledge there really aren't better choices than those in TO-220 device cases. there are bigger N channel mosfets, but not bigger P Channels than the IRF9640. If you find some, and they are at least in the 200V range, please let me know, I would like to do some experimenting on SAZ-1500D's to see if I can get 3000 watts out of one with upgraded parts and transfomers.
The NiNE.1 I HAVE worked on many of those, they are similar to the SAZ-1000D but probably a little more output as the power supply I think is a little bigger, but the output section is pretty much the same size, I would say 1200 watts @ 1 ohm with 14V would be a max to expect from a NiNE.1.