Yeah, saving for a couple of years will do you wonders, and there's always new stuff coming out.
If you're wanting to spend money for a sub at home though, I recommend looking at Parts Express for a crate amp, and designing/building a box yourself or you can buy a box, and screw it on with extra wood as a frame for it, but get a 1.5 cu ft ported box for that particular RE sub.
A crate amp is safer to use because it has it's own internal power source, it's built to have a clean signal, and you can simply just plug it in the wall. Plus you don't need alot of power for home use, if you feed that RE sub it's recommended power, your neighbors will hate you lol.
Oh yeah, another advice, never buy from Best Buy, they overprice alot of things, or sell you shit for the same price of something good you can get somewhere else.