Multifunction printer with D-ADF

Hello everybody!

I am looking for a multifunction printer, both laser and inkjets are ok, though I need a couple of features:

1. It must be compatible with Mac OsX (10.7)
2. I need a scanner with ADF with a duplexing integrated unit, that because I usually scan a lot of documents that are two sided and that would save me a lot of time.

Can anyone help me or suggest a website where I can search specifically for DADF multifunction printers?

thank you!!!

Henry