One more option for your consideration.
I installed the Rockford Fosgate 300x4 amp, Hertz HSK165's in the dash and HV 165XL's in the lowers. From day one I was just not that impressed. It sounded better than stock, but nothing like I was hoping for. Months or a year later, I contacted Bill at Biketronics to see if he had any Hertz 2 ways to replace my mid-bass in the lowers. My thought was that adding another tweeter would give me "more" sound/volume overall. Once on the phone with him, I ended up buying a BT4180 amp, and new Hybrid Audio speakers for the fairing and lowers. Long story long, just by replacing the amp my system came alive like you wouldn't believe!!! I couldn't believe how much a difference the Biketronics amp made of the RF. MAJOR difference!! I tried the HAT speakers, but the Hertz speakers sounded much better than the HAT's, and they were paid for :-). Bill was very easy to deal with, he took the HAT speakers back and sold me the Hertz 2 ways for the lowers. Now I am running the BT4180 amp, HSK 165's in the dash, and HCX 165's in the lowers. The system is pretty freaking awesome. In the future I may add saddlebag speakers. I talked to Bill about running the front 2 channels to the front 4 speakers, and the rear channels to the saddlebag speakers, which he said would be no problem. I have the front speakers on the front channels, and the lowers on the rear channels, and the fader in the middle and it's perfect.
The good-
Lifetime warranty on Biketronics
Bill will work with you to get you happy
Great CVO forum discount
The Bad-
no gain controls (which hasn't been an issue at all)
no remote turn on (amp turns on with the key) Don't like this, but again it hasn't been an issue, just don't like it.
This amp rocks!! and lifetime warranty
http://www.biketronics.com/bt4180/Anyway, it isn't the best system in the world, but it does rock, and worth giving some consideration.