Both of the amps listed are overrated but not by much. For the price you can get them for it's still a pretty good deal. The Hifonics I'm not to sure about since I've never used it but I've heard they are a little overrated too but still greats amps.
planet audio if you can get ahold of the big bang series for cheap. They bench their rated rms every time and come with a birthsheet saying so, not to mention i have had my bb1200.1 tested and put out 132? (?= some number i dont remember).
My old PA Vector D was pretty underrated according to the birthsheet. 1-ohm stable 1200wrms amp, birthed 1059w @ 2 ohms, 12.8V. IIRC, dB Don tested the Vector to be 0.4db louder than the Mmats D200HC. Can't remember the setup or electrical, as that was 8+ years ago.