Tri-city plating in Tn does a great job plating bumpers. The don't just throw it in the tank and cover it with chrome, they fix the odd nicks and dings and polish it to a mirror shine before plating. It comes back looking better than new. Cost is around $225 plus shipping both ways.
The repro bumpers I've seen have tooling scrape marks at the license plate cut out. Depending on the rest of your car, a used OEM and replating is probably worth the difference in $. Plus it will fit perfectly.
