Bon, before you jump on the DTs, how much are you looking to spend on the whole shebang, speaker/sub/receiver? I like the DTs, but that sub is overpriced for its capabilities. I think SVS SBS/SCSs up front and a PB10-NSD sub will provide a more visceral HT experience. These could easily be powered by a Denon 790/1910. For the surrounds, a pair of Aperion Intimus 6-ICs should do nicely.
Ok, saw your other thread, $1200/speakers and 6" height for the center, so the SVSs may be out. The center limitation is going to kill a lot of options.
I think if it were me, I'd do the best I can for 3.1 right now and wire for surrounds, then add them later. The DT's center fits the bill and performs well.