For documents the scansnap is excellent. I had a 6120 and apart from not being mac compatible it was great (I now have some mac compatible variant, not the latest, but it works well and comes with semi-decent software to produce OCR'ed PDFs).

However, for the office I got a Canon MX882 which is an all-in-one printer/scanner/copier/fax. Duplex printing, duplex scanning (document feeder or flatbed), ethernet and wifi. Not as fast as the scansnap, and no OCR software for free, but you can't argue with $130 from Costco.

You can scan over the network or even scan direct to a memory card/USB stick - saving as PDF - without a computer being involved at all.

It's also built like a tank which is a bit surprising for the money.