Dirty little industry secret for you all:
There are only 2 or 3 manufacturers of these things worldwide and they sell them to all of the different companies (Rocford, Monster, Lightning, Stinger, etc.) so what you are really paying for is the name or design on the outside...all of the capacitors work exactly the same and are built to exactly the same specs.
If you aren't going to show them off then I suggest that you just get the cheapest one you can find.