larger the sub, the more unaccurate and sloppy it hits.
if you want smooth hits get a 10. it will bump just as hard as a 12 if you get the right one.
I bought a pioneer 10 inch 1400 watt from none other than walmart, built the box myself and bought an amp off craigslist. all added up to about 120 bucks. i suggest you check out whats on craigslist.