I have an Epson GT-2500 Plus and love it. It's held up well over several years, works perfectly in my mixed Mac/PC network, and has a dual-side (duplex) sheet feeder for up to 50 pages. Plus, the Epson Scan software doesn't bloat up my system with any boot-up drivers or constantly-running processes.

If you're looking for something less expensive, and without duplexing, I'm sure any of the current crop of network-enabled multifunction printer/scanner/fax units will fit your needs - I've just found that these type of devices are in general not as robust or sturdy as are dedicated single-purpose devices.