Id stay away from the triton, as far as drum presets go. I do not like its drums at all, its the weak point. But of course there is plenty to work with if you feed it some samples. I can spot a triton drum from a mile away. plus they are literally weak....need to be tweaked alot.
But as far as presets, ive heard some good ones on the motif, adn i own the mophatt and the PX7 (the drum version of the mp7) yeah its drums are nice.Usually what i do is sample most of my drums from the EMU after i tweak them with the filters.
But if it helps maybe search for a EMU sample cd or motif sample cd. There are tons on ebay, i actually bought one from a member on this site

THat way you dont have to go out and buy a mophatt module. EMU actually at one point offered the mophatt module on a sample cd meant for emu samplers....but im sure you can find some third party cds with the same samples...ive heard some and they are some of the same drums.
If i where to get a sound module for drums though, it would be an EMU mophatt with the expansion cards. THe secret is in the filters and layering. I think the mophatt is worth it for its filters. If all i had was the preset drums, id tire them quickly, but with ability to alter them makes it great. Tweak the drums, then sample them into the mpc.