First off i will be powering the PG RSd 12" sub which is rated at 500rms, but through what ive read it can take more. So far ive been eyeballing the Alpine MRP-M850 cause of how impressed i was with the 450. Would there be any better options for ~$275. I probably will only be sending ~650rms to the RSd but would like the extra power just incase i wanna through a 15" aarrrggghhh in there and see if i can get da dbz.