I picked up 2 of MA Audio's MA12XE subs here in Canada, which is a rare find. They are 12" subs, as you may have guessed, 150oz. double stacked magnets, 350wrms-700max. If you want more info, I'm sure you can find the website. I put them into an old JL Audio 3/4inch MDF sealed sub box I picked them (the subs) up for $50ea canadian, and then I purchased a Phoenix Gold Octane R 1501 high voltage class d monoblock subwoofer amplifier for $150 canadian. It is rated 500wrms @ 4ohms, 1000wrsm @ 2ohms, and 1500max... It's more than enough bass for my 1990 Cutlass Supreme, and only cost me like $300 total. If I were to price it all out, it's probably worth $1500 retail (Canadian) so I am very happy. I have approx. 40 metal cd's in my car, and 4 rap cd's. I do not like rap, but I will admit flat out, that rap tends to have the cleanest bass frequencies...
-Rob