We're considering getting a new computer to replace our ca. 1997 model, which is way outdated. I would like to get one that would let me enter the world of 4x5 sheet film scanning with something like the Epson 3200 flatbed. Would a machine with, say, 256 RAM and a 40 gig hard drive be enough? I can't spend a bundle of money. Thanks in advance for your advice.