If you don’t need to scan transparencies (slides and negatives) then an Epson Perfection V39 (or any in that series) is pretty good. If you do need transparencies then the Perfection V850 Pro (or any in that series) is best. The former is a lot cheaper than the latter!
On the software side of things, there are many options. I use XSane on Linux, but there’s lots of other ones. A general rule of thumb for 8x10 prints is to scan at 900dpi 16bit colour (even black and white) to TIFF or PNG. There are plenty of archival institutions who publish their rules for digitization, e.g. the NAA.
Pretty much any flatbed scanner can be used to scan multiple at once, into separate files — it’s down to what the software supports, rather than the hardware.