Those custom boxes are way too small. I've got an Auto Acoustics box and it's 0.5cl. My sub is very quick and punchy, but doesn;t drop very low.
You'll need at least 0.75 to get a 10" sub working properly, if you want it low and loud, you'd be better off with a ported box.
You'll need to get someone to design you a box if you don't know how. Speak to this man:
email-me@efmax.info - Web site:
http://www.x-bb.org/~efmax/box.htm