What kind of sound are you after? How much do you want to tweak the sound? What's your budget? Here some usual suspects: - FXpansion BFD - XLN Audio Addictive Drums - Steven Slate Drums - Toontrack Superior Drummer/EZDrummer - Native Instruments Drummers (multiple packages) All good stuff with different pros and cons. If you have Kontakt, here's a free acoustic drum set: (sorry, I can't find an English version of the page)