Hi, Inspeqtor,
I've been using an Epson 4990 for about a year now - it replaced an old, failing Microtek that neither WinXP nor Mac OS X had drivers for anyway. Chose the 4990 because there were 5,932 (est) old 35mm slides waiting in a closet to be digitized and its specs, including price and ability to scan reflective copy, seemed adequate to the job.
My experience has been good. Optical resolution is more than sufficient - haven't needed to use the maximum yet. I can scan a slide at 1800 ppi, which is enough to make a 5x7 print at 300 dpi, and see what I think is the film grain in plain-colored areas like sky. What I see could be scanner noise, but I'd expect that to be all colors and the 'grain' I see is the same hue as the background. dMax is not quite as good as you'd get with a dedicated slide scanner, but I haven't run into any slides where it mattered - and I've scanned a wide variety. Performance on old large-format black and white negatives has also been excellent. I've been able to pull detail out of scans that were so overexposed as to be virtually white.
The Epson software is quite good - lots of manipulation capability, and it comes with Digital Ice to clean up transparencies. The few times I've used it (normally I just do un-futzed-with scans) it has worked pretty well. No comparison with correcting in Photoshop, but much much faster if you have a lot of scans to get through. There is also a (slow) copier function which is just fine for a few single sheets.
The bottom line is that I recommend the 4990 as a very capable general purpose scanner for both reflective and transparent materials from 35mm to 8 1/2x11 in size. You can find detailed specs on the Epson site,
http://www.epson.com. I got mine online, can't remember exactly where. Amazon is a possibility. I've also had good experiences with getting electronics stuff from J&R.
Carole