Router table is the way to go, I built one from plans from The New Yankee Workshop and then added a fancy router lift and an Incra adjustable fence.
In the picture below, you can see I just set it up and ran a bunch of door frames for a cabinet- fairly quick setup and very safe, fast and predictable cutting.
You could also just screw your router to a piece of plywood sitting on sawhorses with a hole in it for a grooving bit and clamp another board with a gap in it over the bit to mimic my setup at a less fancy level and get perfect results too. Mine just gives me micro adjustability, bit storage, dust collection and a slimmer wallet!
