Fusion is garbage. Even their boxes.
Kenwood isn't anything to write home about.
If your looking for a decent cheaper amp look into T.M.A. or MB Quart. I got my MB Quart for cheap, brand new in box for maybe 65$. Renagade isn't that bad either. I have a Renagade 1000 watt Mono (500 RMS) although I bet it doesn't even touch 500, but it sounds good and I have zero issues with it.
K&N Typhoon - F2 Header - 2.5" Exhaust - C-F-M Pulleys - FSWerks Tune - VF Engineering Mounts - FRPP's