Heres a few amps that will work nicely with your subwoofer:
http://www.sonicelectronix.com/item_9852_Rockford+Fosgate+Punch+P300-1.html
http://www.sonicelectronix.com/item_6750_Kicker+ZX300.1.html
http://www.sonicelectronix.com/item_6470_Alpine+MRP-M450.html
http://www.sonicelectronix.com/item_12247_JBL+GTO3501.html
http://www.sonicelectronix.com/item_11796_Kenwood+KAC-8104D.html
http://www.sonicelectronix.com/item_9927_Memphis+16-PR1.500.html
If I were too choose any of these amps, i'd go with the Memphis amplifier. It may be the most expensive, but it's a hell of a nice amp and well worth every dollar. Very good quality indeed.
However, if you didn't have that much money to spend, i'd check out the Alpine amp. Can't go wrong with Alpine products =D