I have a lot of 5x8" prints from photographs taken on various trips. I'd really like to scan all of them and keep them archived on my PC. Ideally, I would like to be able print any of them on a full A4 page (my Epson 890 can print without borders) and keep the quality tip-top. The big question - what's the best resolution to scan them at? I've tried 300dpi and they look fine (on the screen), but I'm wondering if it's worth using the extra HD space by scanning them higher. The Twain software that accompanies my Canon scanner allows me to scan up to 3600dpi though I doubt the hardware can really do that. Going from 300 to 600dpi makes for a much larger file - so is it really worth it?