What amp should I go with ?

I have two 12" rockford p2's and a custom box, but I dont know what amp I should go with. there's a picture of my sub box. I use to run a rockford 3001bd amp but want sumthing more powerful this time. anyone got any suggestions?

http://www.cardomain.com/member_pages/show_image.pl?image=http://memimage.cardomain.net/member_images/6/web/2622000-2622999/2622443_4_full.jpg