It's time to give my computer some bass. I'd prefer to go the DIY route unless there is a more cost-efficient alternative since I'm only willing to spend $150. The box needs to be relatively small, preferably less than 1 cu ft external, 1.5 absolute max; it's going by my feet under a desk. It will probably be ported and stuffed with polyfill. Decent sound quality is a must. For comparison, I've heard the Klipsch Pro Media 2.1 setup, but its sub doesn't play low enough to suit me. I've been looking at a 100W Dayton plate amp for $75 (SA100) and a Tang Band 8 for $52.60 (W8-740C) both from partsexpress.com. Also been eyeing the Elemental Designs Eu-700 at $50. I just want something that will play deep bass at least down to 30 Hz and still sound good. What would everyone recommend I get? Sorry it won't let me post the links to those items.