Yes, you don't want to bring up the filter no filter debate. I have used them on most of my lenses for years. Personally I would rather frame a shot with a filter than spend hours trying to correct the problems with a photo editor.
B&W makes a very good UV filters that produce nice results with minimal reflection (thus the prior multi-coated suggestion), for a slightly lower priced option I have used both Hoya and Canon filters. If you want to spend almost as much as the lens you could look at Sing-Ray.
Mike