you're going to have a hard time finding a 12" that wants 1 cubic feet that will sound good. most likely its going to be boomy and not as loud as u want it to be. the low-end will suffer and you'll need more power to get the sub moving. and this is sealed. ported would be much louder, but u don't have the space to do so. a 12" solobaric will sound peaky in 1 cubic feet sealed box. those subs require a bigger enclosure to get the best out of them.
how many subs do u want? how many space TOTAL are u willing to take up? how much are you going to spend on the sub/amp?