Quads souinds like the best idea and here's why....
If you have the 16 ohm version of the sw 12, then triples will work but youi are left with 2x 16 ohm version...... I guess you could make them into a single dual in the rear of theroom but not 2 single sealed for rear..
Actaully going this route would be good as well, the single dual in the rear would be good and you already have dual cabinets..... I think Early-B runs a single dual 12 in the rear of his room and loves it
If the 8 ohm version of the sw12, you can't go triples with them , impedence will be too low.
If you went with quads up front, there are version of the A370 that will work in master slave mode so one amp controls the functions of both on that channel. If your A370's have this already , great.... if not, Brian at Rythmik MAY BE able to mod them or you could sell and pick up the necessary versions.