Dude, subthump.com all the way. Its the best of every world. Custom fitting, saves you space, and all wood enclosure. Everyone one here that has one, loves it.
And while you're at it, get the amp rack for the passenger side. Lets you mount your amp cleanly on the passenger side, and only takes about 2" of width out of the cargo area (plus the thinkness of the amp).
These pictures are old, so you don't see the amp rack. I'll see if I can find some pictures of mine with the rack in there.
Miss my Focus, but proud owner of a 2006 Explorer!
Former owner of an 03 Focus ZX3 Modded: Rims, SVT stuff, Tons of audio stuff with Kenwood Headunit, MB Quart Components, and Subthump Stealth Hatch Enclosure and Amp Rack Loaded with Kicker Goodies!