i don't remember right, but steve said it would be a tough choice between db-12 and hw12. i can't remember how many woofers he was talking about. try to find it in the old forums. that's where i read that.
from what i've been told, it would be better to build a HW when having 2 woofers available. i'd vote for more acuracy, and choose 2 db-12 if room is available.