i have been looking at buying a Rockford Fosgate P3 or T1 12, but i don't know how much of a difference it would be to buy the T1 for $100 more. would it be worth it? either way, i think i am going to get the Kenwood KAC-9104D which is rated at 500rms at 4 ohms, 900 rms at 2 ohms, and >900rms at...