Hope you don't mind, and I don't know if you're a name whore or not, but I took the liberty of finding you a few more options that are great subs and great prices. Any one of these should match up pretty good with the amp you already have. All of these are priced from sonicelectronix.com I have done a lot of business with them in the past and I have never been disappointed.
MA Audio MA8QS = $49.99
MA Audio MA8QS 8" Component Subwoofers Car Subwoofers Car Audio and Video - Sonic Electronix
Polk Audio DB840 = $54.99
http://www.sonicelectronix.com/item_...dio+db840.html
Rockford Fosgate P1S48 = $59.99
Rockford Fosgate Punch P1S48 8" Component Subwoofers Car Subwoofers Car Audio and Video - Sonic Electronix