What do you think are the best SPL subs for around 200-300 each (ebay) that do not sacrifice SQ to badly. Any Size 10-15". I am thinking of upgrading from 2 12" Power acoustiks, (which obviously needs a upgrade i know) but what would u suggest, i have a camaro so i do not have a lot of space. I could probably do a ported box with 1 12" or 1 15" sub. but with 2 subs, i have no space for ported and have to do sealed.