Those trim routers such as the one Bill links to are a good size, one drawback however is that they do not [all] have variable speeds like the dremel. This can make a big difference depending on what materials you are cutting. For example, the trim router would probably be good for wood, not so much for foam or plastics. Good link!
UPDATE: Sorry, Bill. I didn't read those specs closely enough! The router you link to does have variable speeds.