Ok, here's the thing with the xxx and two amps: The xxx comes standard dual 2 ohm so you'd need 2 amps that could put out power at 2 ohms. You could also get it, for more money, in quad 2 ohm coils, or quad 1 ohm coils...in which case you would probably do quad 2's and wire 2 coils in parallel to each amp driving 1100 watts to both pairs.
If you're stuck on the amps, then I would ask yourself if you'd be happy with 1100 watts to an XXX, which is plenty in the right box. If the answer is yes, then you could get away with a single amp and a dual 2 ohm driver. If the answer is no, then you're going to have to do one of two things. First, you could buy 2 amps and upgrade the sub to quad 2's. Second, you could look into different amps. The reason you would have to upgrade the sub from dual 2's is that you'd only be getting 600 watts out of each amp for 1200 total, compared to the 1100 you'd have just running one amp.
Hope this makes sense, I'm kinda tired, but ask questions if you don't understand.
EDIT: guess I better not do other things while I'm typing a post, didn't have any replies when I started.