MB Quart is now owned by Rockford Fosgate, so I wouldn't buy amps from them. Generally stay away from anything Audiobahn.
When Audio-breaks stuff reaches the RMS power rating, they tend to do just that, break. As for JL, their subs are alright, but their amps are so-so.
Also, instead of buying a capasitor (which do little to nothing), spend that money on a High Output alternator.
What I would reccomend is somthing from Phoenix Gold or Precision Power (PPI).
For car audio stuff, go here:
http://www.the12volt.com
Paul
*EDIT* Also realise you impedance options for those subs are 1 ohm, 4 ohm, and 16 ohm. Unless you wire them stereo, which I wouldn't reccomend.