Thanks ifonline. I see a lot of talk on these forums about using the Trigger IO to add more stuff to a DM10, but I haven't really seen anything about using one by itself.
Of course, I'm also looking this used Roland TD-8 on Ebay, currently at $158. I haven't even heard anything about this model, but I hear Rolands are good in general. I have a friend with a TD-9; he thinks it's fantastic. Only one less number, right?