I'm not sure if it would be suitable for the way you work, but you should consider Reason.
There are lots of Refills about and I picked one up recently that had sampled ALL of the sounds from the DM5. Very useful, you simply load them into a ReDrum module in Reason and you're away.
It obviously also gives you a lot more than just a drum module...
The other two that spring to mind are FXpansion's BFD (very good) and NI's Battery (never used it).