Low Profile Sub for Extended Cab Truck?

Need help picking out a sub for my truck. I want to put one under the rear seat, so I can still use the other side for storage, and I do not want to sacrifice the center console/seat.

Last time I bought a low profile sub the Pioneers where brand new and had terrible reviews. I ended up buying some Earthquake subs, and was pretty happy with them. Now it seems like everyone makes a low profile sub.

I am thinking I want a 10" sub, I could possibly fit a 12" if it where not much more than 3" depth, but I think more room would be ideal. A 12" would be pretty tight, and I may not be able to give it enough air space.

Here are the specs for my amp.
4 ohms stereo at 12.5Vdc = 25x2
4 ohms stereo at 14.4Vdc = 75x2
2 ohms stereo at 14.4Vdc = 150x2
4 ohms bridged at 14.4Vdc = 300x1
Minimum speaker load bridged = 2 ohms
2 ohms bridged at 14.4Vdc (current limited) = 300x1
Minimum speaker load stereo = 1 ohm
1 ohm stereo at 14.4Vdc (current limited) = 150x2

These numbers are RMS and may be slightly under rated, as its an old PG amp, but I do not have a birth sheet. My alternator puts out over 14V while driving, just under 14 at idle.