I'm curious as to the differences between the SAZ-1000D and SAX1200D besides size and power.  Is there a durability difference?  How about sound quality?  The reason I ask is I'm planing on an FI Q 12" in a  sealed box with a 1000 watts.  Is there really any advantage to the 1200  over the 1000 besides power?  I like the lowered pricing of the SAZ1000, but if the 1200 is going to be significantly better, I'd be willing to shell out the extra dough.