One with the highest wattage you can afford and a very good cutter,anything below 900watts is a hobby type router.
Pointless giving you a brand as there will be an argument over their quality of use.
My heavy duty router is a Ryobi 1500 and the lesser evils are two old B&D and a newer B&D.
Ive got one too, but prefer to use a tiny Bosch POF500 if possible as the Freud is a bit of an animal (but very capable)I can recommend one of these I have had one for at least 10 years and nothings phased it.
