But to Kevin's initial question, if all he needs is web resolution then there is very little to be gained by scanning that high. Or for a 750 versus a 4990 model.

Stay on the look out for an Espon 4990 - they come up as refurbished items once in a while - $2-300. Or find someone's lightly used one.

There are some Microtek M1s out there as well but they had reliability problems when new. A proven used one maybe better ;-)

Other scanners that used to do 8x10 were made by Linotype and Agfa but I think they were all SCSI-interface and need ancient software.