This is the one I have in my car running my 12" sub... http://cgi.ebay.com/SOUNDSTORM-1200-...item588bb9e4d4 . Does the job nicely in my car, gives me nice boom from my single sub, is 2ohms stable, and is cheaper than the ones you are looking at, plus you can get two for $150. Should easily run your subs.
Hope this helps you in your decision!!!