Check out the NVX VC series 10. I know a lot of people havn't heard of NVX before, and some have even called them crap simply because they've never ran them, but these are actually pretty built and really good for the price. I ran a couple of their 15's (VCW154) in a 5 cu ft box in my last rig. Stupid loud for $250 subs. I didn't even have an amp big enough for them and I was almost hitting 150 db.
Here's a link for the 10" version
Here's what I ran. They are pretty damn good looking subs. I even put one in my 04 Coupe
(I run them inverted to save free air resonance and to save box space. When tuning you have to accommodate for the sub magnet, plus they look BA, and I still get a ****-ton of what little trunk space we have.
In the Jeep
In the G