Michiel,
How are the film holders for the 4990? For those folks who are looking to scan larger format images, this always seems to come up as one of the important points.
A housemate of mine, who was a professional photographer, had a flatbed by Microtech which worked well for him except for the fact that the tray for the 6x7 only held several single frames, no strips. Epson seems to have improved on the tray configuration, but some people still seem to have mixed opinions.
In the end .. Not too many affordable choices if you want to scan larger than 35mm.
Thanks again,
MArk