best canadian musical sub for under $400

[lazyhaze]

hello,

my 5.1 system has until now been comprised of whatever used speakers i could find cheaply. i have started to upgrade things piece by piece as i am becoming unsatisfied with my cheap gear. i listen to and produce a lot of bass-heavy music, mostly experimental electronic stuff that has really outpaced my sub. I have a little Sony 50 watt 8" that is fine for tight beats, but starts to make horrible noises when a song with a deep bass line comes along. i use my setup for HT as well, but the ratio of music to movies is probably 80/20, so i would like a musical sub. my main preference is to get a deeper low end then my system is currently capable of, so i've been thinking a 10"...a compromise between tightness and depth. i really want to be able to feel the bass, this is more important than volume, although i would like to be able to drive it hard on occasion. i live in canada, and although i have seen lots of recommendations for SVS and HSU on this site importing them is too costly for me. I would like to stick with a canadian manufacturer, as they give me the best value/quality ratio. the brands that are available around here are Paradigm, Energy, PSB, Mission, and B&W, as well as the usual Best Buy stuff that i try to avoid. Mission and B&W seem to be significantly more expensive, probably due to import duties again. My budget is extremely tight, i am an audio engineering student and blew most of my money on a Paradigm CC-370 recently. my budget is $400 CDN, could i get a significant upgrade and a lower bottom end over my current $100 CDN sub? I am living in a small room that isn't hard to fill with sound. i heard a PDR-8 at my Paradigm dealer when i was auditioning my CC-370 and was not impressed at all, is the PDR-10 any better?

thanks in advance for any advice given!