I agree with Rod the Nikon will probably do a good job for you, I don't know how time consuming the Nikon is (I have a Kodak slide scanner) per slide but my Kodak takes about 15 minutes per 3600dpi 2 pass 8 bit scan and ties up my computer at the same time, so what I do is to scan to my lap top, burn them to CD then edit them later on my desk top computer, Nikon does not have a batch scan adapter built in or included but they do make them and sell them separately so you'll want to see if they have one of those too or you'll have to hand feed them each time.

Or the other thing you might considder, buying a used scanner off ebay using it for a few months then reselling it.... might be cheaper than 2 weeks rental if you might need it longer than a week.

On a related note, did you see the rental prices on camera memory? $105 for 3-7 days for a 512mb Compact flash memory card..... I just bought one for $95.00, same thing with Smartmedia and smaller CF card prices.... cheaper to buy them.