recommend a all in one printer with duplex

can anyone recommend a full duplex all in one printer with network support.
good snow leopard support is important
lowest disposable costs is important

dont need blue tooth but Ethernet support required
dont need color would be nice if disposables are inexpensive
dont need a fax machine in the all in one combo

thanks everyone

Lexmark 6575 (from 6500 series) can be had for a good price if you search around. Picked up mine for $100 Australian, has wireless network support, excellent photo printing etc. Does include fax, pleased with mine, inks are relatively inexpensive ;P

How 'bout something from here: Duplex Printers - Printers - Compare Prices, Reviews and Buy at NexTag - Price - Review