I just got an Epson V700 to replace my Epson 3200 Photo. It was $517
from B&H and I really like it. It scans up to 6400 DPI with one lens
and 4800dpi with an automatically interchanging lens. I didn't really
see a difference between the two lenses and DPI scans however. Nice
features are a much larger film scanning area (12 single mounted 35mm
slides or 24 frames of slide film), digital Ice and color restoration
which works well on older slides, and improved slide and film holders.
Those holders have adjustable height spacers that really do improve the
sharpness of the scans. I have read a couple on line reviews that
compare it favorably to the Nikon Coolscan scanners, at least for 35mm.
The Coolscan scans are sharper IMO, but only in comparison. The Epson
seems to do a very nice job, a good price point and excellent
versatility. Plus it has a flat top for laying papers on when not in
use. If you already had a 4990, the improvements may not warrant a new
purchase, but I certainly think it is worth $60 more than the 4990 if
you are in the market for a new scanner. It is probably close to the
best that flatbed scanners are capable of, the limiting factor being the
diffraction inherent when scanning through glass. The V750 has
antireflection coatings on the glass surface, but in a review, did not
perform any better.

Dale Yingst