I just read a review in WOOD magazine where they tested six or seven different router kits. They tested routers from Bosch, Craftsman professional, DeWalt, Makita, Porter Cable, and Skil. Skil being the low end and I think the makita was the high end ( about $100 to $270).
They rated each unit based on several different criteria including: power, how well the fixed base worked, how well the plunge base worked, control layout, and price. According to their standards the best value was the bosch kit followed closely by the craftsman professional (both about $200).
They did say though that all the routers handled what ever they threw at them, but that the more expensive routers where built better, i.e. better bearing , larger motor armature etc.