What is a good amp for an Infinity Reference 1262w 12- Subwoofer?

You could get a Crunch amp (1000 watts peak) and it costs 90$ at fry's or get a 1000 watt kenwood of off craigslist, they will both do the job since your sub is only 300 rms so you dont need anything crazier than that. You could also get an 1000 watt xplod from craigslist for 50$ easily if not cheaper. WHATEVER YOU BUY FROM CRAIGSLIST, TEST IT FIRST!!!