O.P. Before I ad my suggestion I'll let you know I have been in car audio (selling or installing) off and on since 1995. So from my experience you would be better off with a higher quality sub/box/amp. I used to work for an S.A.S. dealer, that's who makes Bazooka, and they were a great idea. But you really pay a premium for the ease of installation. You want good clean bass for cheap? Buy the BEST sub/box you can possibly afford then power it with a decent amp that matches it's power rating. If I wanted to buy something small, and affordable for my civic.... I would probably get this.
http://www.crutchfield.com/p_136S110R12/JL-Audio-CS110RG-W1v2.html?tp=112
That will go right up against the back of the trunk with minimal storage loss.
then you need 150-300 watts of CLEAN non bullsh%$ amp power
http://www.crutchfield.com/p_236TN2002/MTX-Terminator-TN200-2.html?tp=115
That's a decent deal
Here's what I would get to power it (just my own opinion)
http://www.crutchfield.com/p_500MRPM500/Alpine-MRP-M500.html?tp=115
Or the other amp you were looking at would work also. Just please buy from a authorized dealer and hook it up RIGHT. or you will kick yourself hard in the junk.
Tip: If you aren't paying $35 or more for an amp-install kit... chances are it's not a good one.
Another option would be a decent 4 chan. amp. Power your doors off the front, Bridge the back for the sub. I don't know how much you know about car-audio but if it's not much, READ up on some threads first.
If you do it wrong, you either waste your $ or burn your car to the pavement...Yes that IS possible. Unlikely but possible. Sorry for the long post but I like to be as thorough as possible.
Oh yeah....here's a good deal on the 4 chan/ route.
http://www.crutchfield.com/p_500MRPF300/Alpine-MRP-F300.html?tp=115
Either way, do something like this and use RCA cables instead of high level inputs... You'll be more then happy, and I'm sure others will back me on that statement. Good luck Bro!