Yea, I can get amps real cheap now, because I can repair them....
I was going to recommend the ED SQ10 sub also, Parts Express has a sub made by Tang Band...it's the exact same sub, single 4 ohm. ED said Tang Band copied them....doubtful, most likely the other way around.
http://www.partsexpress.com/pe/pshowdet ... er=264-862
Pioneer, Blaupunkt, and Kenwood make/made slim subs....but from what I've read, they aren't that special.
There is no replacement for displacement....that should answer the last question. Depends on (Sd) cone surface area and the excursion (Xmax).
Regular cab....not much space to work with, good luck!
Ported would probably be the best bet, to get the most output.
As for an amp, what's the budget?
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Brando