Fi X12 Sub

[SoundOfViolence]

Im going to be ordering me one of these Fi X12's and i was wondering if you guys got any recommendations for an amp? I wanna push this sub to its max (400w rms). It can be single 2ohm or single 4ohm.

I found this amp

http://www.audioque.com/AQ750-Amplifier_p_46.html

Or for a cheaper one somebody showed me this

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=269-189

Any suggestions? Feel free to post different amps you might think are better. My budget is max $250

(im just a noobie trying to build is first system)

Thanks for the help guys!