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.