Multifunction devices are for saving space. They can do several thinks "OK". They, typically don't do anything "great". You can get decent quality scans of prints and improve them with photo manipulation software. The slide and film scanning attachments that come with some of these will not give the best quality. If you want decent detail in enlargements, you need a device designed for the purpose. These are not inexpensive. Unless you do a lot of work with these, you are better off going to a photoshop that has made the investment in high quality scanning equipment. 35mm scans should be 4 or or megs in size for the most part.
Got no takers last time, so I'll try again. I have a deskjet 5650 (4800 dpi) printer. But I want primarily to scan photos, negatives, and slides and get really good quality prints from them. I don't even have a digital camera, but that may come someday. Would I be better off to use the printer I have and get a good (9600 dpi?) scanner? Or get a MFD like the HP 2610 or Epson RX600, which has good (2400X4800 dpi for the Epson) scanning and somewhat better (5760X1440 dpi for the Epson) printing? Which will give me higher quality results, the MFD, or current printer and good scanner?