Originally posted by DavidFDM
Dear Noel,
I haven't looked at specific brands for some time but I would keep in mind these considerations:
1. Density rating (also known as D-max). This is the key value used to compare scanners. Resolution generally doesn't matter. All scanners are capable of very high-resolution scans but in the end 90% of the continuous tone images will be around 350-400 ppi at 100%. This will let you output to 175-200 lpi. Anything beyond this is really a waste. However, the high D-max, the more depth the photos will have. Dark areas won't go directly to rich black blobs. You will get better color fidelity.
2. Connector. Avoid USB. It is too slow a bus to transfer high-res photos. Get either FireWire or SCSI.
3. Transparency unit. Some scanners feature an add-on to scan chromes. I have this and it has proven to be invaluable with my Linotype-Hell Saphir. It does an amazing job with 2.25 format and up. I bought a Nikon Coolscan III
for 35mm.
4. Software. All this really doesn't matter if you can't get the image into your computer. OS X compatibility is important. I have been using VueScan to drive both scanners and have been reasonably happy with the results. I really need to spend some time and money on calibration across my devices.
Those are my thoughts. Best of luck,
David