I like my DD1508... 8 8s is a good bit of cone area, and that's a nice amount of power. I think you would be pleased with the 1508. And you'll have room to add more power if you need
Just ordered a pair of Shok Buds, will give my own review of them when they come in. All the reviews I've read make them out to be incredible, especially for the low price.
http://www.caraudioclassifieds.org/forum/car-audio-product-reviews/102861-shokbuds-%5Bsonics-review%5D.html
http://www.caraudioclassifieds.org/forum/car-audio-product-reviews/99694-review-shok-industries-ear-bud-splaudiohz.html
And they have just received an upgrade
http://www.caraudioclassifieds.org/forum/shok-ind/103406-shok-buds-just-got-upgrade.html
If your anywhere near central Lousiana, we have a company called Lunar. They have some of the smallest footprints I've seen, and they will happy make you a custom heatsink to fit multiple boards.
If you were to do that, you would have to wire at 4ohm, which is 2ohm per amp. The amp is rated for 800 or so at 2ohm, correct? 2x800 would be 1600wrms, which would only be a 400w improvement over your single AQ1200. Hardly worth the $250+ IMO. A AQ2200 would be much better as you could run it at 1ohm...