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Use the Terro. It works.

As a cat owner, I have a lot of difficulty using insecticides indoors, as a result. I never know what my cats will decide to play with, eat, walk through (and then lick clean), etc. IIRC, Dan has cats. I wish there were a non-poisonous solution that worked as well. The only things I've found that works is... nothing, really. I find a trail, and follow it back to where the ants are coming in, and fill it with silicone tub/tile sealant. Repeat ad nauseum, as they find the next hole. In my old apartment, I smeared olive oil around the baseboards, ceiling, and where the cupboards met walls -- the type of ants I had didn't like to cross the oil. It kept the ants out of the kitchen, but it didn't solve the real problem (of course, it's really the landlord's problem). That won't work on all ants, though, since some eat grease.

Oh, and sometimes ants can be a good thing -- I found one trail of ants leading to... a termite hole. They were dragging termite bodys along.