used subs: $500

Hey folks...tight budget...looking at slightly older subs that retailed for around 800-1k used: application:music
paradigm 2100/2200
b&w asw 2000
mirage 150 bpi
velodyne ct-150
polk psw 650
I would add the sunfire Super Jr. Small, fast, and deep.
theres an HSU sub with amp on the gon going for peanuts..I would think that at that price it's a steal and They are known for making a good sub.
A new SVS PB10-NSD is $429; PB12-NSD is $599. I think SVS and Hsu Research are a big step up from the Velodyne and Polk subs you listed.