I have a pair of those very same subs . Great for the money , really loud in a fac speced ported box , currently powering them with a power Acoustik amp but have searched for a better named brand to upgrade to . Thess 2 subs wired parallel would = 1 ohm load
Here's a list of what i found : power @ 1ohm ORION 1200D - 1200wrms $409 MB Quart Reference RAA1000 - 1000wrms $299 DEI - Directed D2400 - 1200wrms $330
Personally i like the Orion , these brands are mid-priced - if u like to know what i found in the more expensive catagory , let me know .