Good shallow-mount sub?

[DFA]

Well, apparently, no one wants to ship a sub over here for anything under 80+ bucks, which is an outrageous amount of cash I'd rather put towards paying for the amp that will be moving this sub.

talnlnky, those subs look sweet as hell, and if the circumstances allowed it, I'd be all over those babies in a heartbeat.

I guess at the moment, I'll have to decide between the Rockford and the Pioneer, which are the ones I know for certain are available locally. (I'm pretty sure I've also seen a shallow Kenwood around, but I haven't even researched that one online.) The Pioneer seems to have better frecuency response than the RF, is that a sole criteria to base my decision on?
I mainly listen to metal so I don't really have a craving for big fat booming bass. I understand the limitations of shallow subs on that area and, as I said, I just want something to give me more thump than a basslink, and is easier to stealth under the spare tire cover. I believe either sub will fill this role pretty nicely, but I'd still like to make an accurate shopping decision.

Found a guy willing to sell a P3SD412 for $150 already in a carpeted box, really tempting offer, considering other shops have it for ~$200+ unboxed. Guy works at a reputable shop and has won a crapload of car audio competitions, so I guess the sub should at least be in working condition.

Thanks for all the suggestions and feedback, but apparently living in the middle of nowhere has screwed me over once more.