You do realise that its 24A across all 12V rails, and that the ATX spec limits single rail to 20A. So you need to look for dual (or greater) 12V rail PSU's. With regards to amperage not all will do 24A, Seasonic, Tagan, Hiper, Enermax will all manage it quite happily as will many others. Look on the their own websites for full details, you'll get to learn other bits and pieces about the PSU, such as fan control. PSU 101
Have a look at the link inside that link it will explain a lot. Personally I've just upgraded to a Seasonic S12-600 although the M12's are coming out, M is for modular in this case.
What else are you running?