I have an RE SE 15 in a 2.2 cubic foot sealed box running off of 650 RMS from a Tsunami DB1100 @ 2 ohm.
I like it, it sounds pretty good. I'm upgrading to a pair of Type R 12s though, because a 15 in my trunk is hard to deal with when rear firing (low clearance with the rear deck) plus I wanted to get my amp to 1 ohm and use all of its potential power.
I liked the sound of the RE SE 15, it's a nice powerful, durable, and reliable woofer. I've been using mine for well over a year with constant use. It knocked my rear view mirror clean off of my windshield already.
I believe they are 220 bucks shipped from RE directly. I'm pretty sure it was 200 bucks for the woofer, and 20 bucks shipping.