Another thing to add - the old stanley routers can often be had pretty cheaply used.
And as others have said, using the Veritas blades is a good option (for the Stanleys as well) and then if you get a metal router plane, you've got two planes that can use the same blades, so even if you ditch the original router, you've got blades of use to you.
" Be willing to make mistakes in your basements, garages, apartments and palaces. I have made many. Your first attempts may be poor. They will not be futile. " - M.S. Bickford, Mouldings In Practice