Superpilot,

If you can manage the time and expenses an interview requires, I would recommend going. You will meet a lot of people, get another perspective, and maybe even decide that AirWhiskey works out better for you--not that those of us at Comair wouldn't love to have you below us.....err with us!
I interviewed at Comair one week, got the job on a Friday, and then interviewed with ASA on the following Monday. I was pretty confident I would much rather commute to CVG over ATL from where I live, all other things being pretty equal, but I went to the interview anyway for the extra practice and to fly the CRJ-700 sim they were conducting the sim ride in. Hope this helps and good luck!