the 35 series sound good as well. if you port a box properly it can sound very very well.
My 9512e would get LOWER THAN almost any 15 or combo of 15's in the area, while still sounding very good in the upper frequencies of the low end.

you'll be hard pressed on which set up will hit harder. Do you want harder hitting or bigger #'s on a mic? port a box high and you'll get hit in the chest, port a box low and your balls will vibrate all over the place. Its up to you.