Alright so here's what I've got put together. Only question is which PAC I need to buy?
I'm going to use the AA amps.
200.2 to the JBl P660c's. 200x2 @ 2 Ohms stereo. Read how they handle the power really well and like that they handle lower frequencies more than others I read about.
400.2 will get bridged 400x1 @ 4 Ohms to the Sundown SD-2 10D2.
The AA's have a crossover built into them but it's separate from the amp. So if I'm correct based off reading the manual again I send 1 set of preamp from the PAC back to the crossover input of one of the AA's.(not sure if it matters which one). Set the crossover freq about 75 Hz. High output (75+) of the crossover signals get sent to the input of the high amp via RCA. Low output (75-)of that amp goes to the input of the sub amp. So for instance in my design the main preamp goes in the 400.2. Low out goes right back into the input and the high out runs to the 200.2.