I am looking for a place to have color slides and b&w negatives professionally scanned. I'm looking for the highest resolution (4,000 ppi). I have found a few places on-line (White Glove, ScanCafe) but most require you to mail them in (some to India) which makes me nervous. Has anyone had a particularly good experience (or bad experience) with any of the scanning services.

I would really appreciate a recommendation based on your experience.

Thanks!