I'm looking for an amp for Dayton Audio RSS265HO-4 10" Reference HO Subwoofer 4 Ohm. I' probably giong to order it soon and will need an amp and enclosure for it. I found a local guy that will sell me a rockford fosgate p6001bd for $180 possibly lower. It it lightly used and practically brand new (it was only used in a show-car) Would this be a good deal and a good match for the sub? or would I be better off with something like a MRP-M500 - Alpine Monoblock 500 Watt RMS Power Amplifier new from amazon for $125. What would bet the amp that gave me the best SQ for my money? I would like to keep it under $200 and would rather it cost less if I wont notice a huge difference in performance.