The 1501's are meant to be strapped into a 4ohm load. Unless you plan on running a set of strapped 1501's to each sub or 1 to each coil your best bet would be another amp. Something that makes power at 1ohm.
As Denim was suggesting, the Kicker 1200.1 and 1250.1 would be a good choice, I run the 1200's and love them. They dont get that hot run below rated impendances all day. 1500-1600 watts each should get them moving //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif