best scanner?

Hey People
Looking into buying a scanner.

at the moment got a multifunction printer one what great with the next work but only 600 dpi. its a panasonic DCP-262

Want to scan photos and slides. and what it to be a really good one.
A4 could work but A3 would be better and network support would be great as got lots of photos so what it easy to do bulk.

any ideas
thanks