the sub question can be a little more complicated. some will tell you that you cant ever have enough sub.. while others will say that moderation is the best bet. there is no doubt that the STF-2 will get the job done, but there is no question that the STF-3 will get the job done BETTER. the low LFE's are essential to the HT experience, so it is highly recommended not to skimp on the sub.
the HSU brands are fantastic subs.. the STF/VTF series are as good or better than most. you may also look into the SVS subs.. their PCi and PC+ series will probably be the best match for your room. they also make box speakers if concealment is an issue.
you have yet to mention a wife, so we dont know exactly what your constraints are
bigjohn
