I'd go with discs on a road-style bike for a commuter. The lack of discs (and the lack of eyelets) is probably the only thing I don't like about my CAAD8 regarding daily riding; and the MTB handlebars are the only thing I might change on my Bad Boy Disc.
dynaryder, your DBX is an XL size? What size is your BBU? Sold the DBX yet?