I recently purchased an RCA 12" 200watt powered subwoofer from Radio Shack. It hits hard and sounds good (could probably benefit from a good calibration, but none of my local radioshacks carry SPL meters), but in my never ending cycle of upgrades, i'm considering replacing the driver with a 12" Swan 305. Does anyone have any comments/suggestions? The 3/4" MDF enclosure is nearly 70 liters (67 liters). It has a 3" diameter down firing port and 1" rubber feet. I have the sub sitting on a 1" thick concrete patio block. Will the Swan 305 make a good replacement driver? Will it make enough of an improvement to warrant the $60 or so i'll be paying for it? Would i be better off buying an old model SVS driver from someone who has upgraded? Does anyone have any other suggestions in the $50 range? Thanks P.S. I'm also interested in refinishing the sub w/ a gloss black instead of the satin wood grain it currently has... how would i go about doing that?