im gonna say boost
simply because in the long run it is the "best" route.
an all motor setup can net you low 12's, but it will be loud as balls among other things.

if u want to hits 12's on a daily driver or for the least amount of money...
personally i say build a b20vtec for boost.
you can check out this local forum from my island, alot of guys making ALOT of wheel horsepower, all from a CRV block+b16a head...and boost.
www.b20vtec.com

you can probably throw together a somewhat powerful and reliable turbo setup for under $1000 with the IC being the most expensive part. the motor itself should also be under $1500 total if you build it yourself.

~kris