Scanners and Scanning Services

This might be the wrong forum area, but does anyone have any experience with scanning services. I have several boxes of old photos and negatives that I would like to scan (probably only some, not all). Can anyone recommend a scanning service? Would I be better off by a dedicated scanner such as a Canon Canoscan 9000f? I have an all in one printer/scanner at the moment, but I would like to create better copies of my old, pre-digital photos.

Thanks.