I am pretty sure you are wrong on the differences in power in a daily app between the AQ1200 and the SAE-1200. I can tell you for sure 100% the SAE-1200D puts out way more power than that AQ1200 board. The build quality of the AQ1200 is better than the SAE-1200D, IMO, but definately not near the power.
And yes. AQ3500 = SAZ-3000D but with spring clips (reliability issues, no ********, I see this crap everyday) and for the price it's a bargain, but too bad it has the spring clips.
I see you have a high post count here, so you been around this stuff. I see you ran some Sundown products and still have some, matter of fact I think I remember talking to you about some of your setup at some point. I can assure you I am not on the Sundown payroll, like you suggest. I actually buy the amps from Sundown and then they are mine, I am on my own. I wouldn't bother with them if they were junk, they are not. The reason we have so many 1200's is because they have been piling up for about a year now. They were not a hot seller in refurbished, most people preffered to buy new, so they sat there. I would say we have only had 25 out of 200+ SAE-1200D's come back, and most of it was user error. Some of them were clearly abused, scratched and dented to hell sliding around in the trunk. Though the original SAE-1200D model was built like ish in my opinion, it is extremely powerful, and much more powerful than that AQ1200D board, the new SAE-1200D v2 (I have seen the board already) is much much better and along the quality lines with the other amps Sundown offers. Though it's still a China amp, the design is the same with improvements, many more caps was a big deal, needing a double sided board was a big deal, and an improved layout was in order, and all of those have been done with the v2. I expect even less of them to come back except for abuse, improper use will kill any amp, if you don't believe that I can invite you to my shop and blow any amp up in less than a minute to show you that. But I know its not necessary, you already know all this.