If you have to get up to scan somewhere else in your office, it likely will not happen.  Its best to have desktop scanners for productivity. 

We have used and worked with many desktop scanners over the years.  Fujitsu has been our go-to bulletproof performer.

The Fujitsu Scan snap is the entry level around ~$400 and they go up from there.  If you are looking to get started wiht scanning, you cannot go wrong with a Scan Snap.  If you need a LOT of speed, and will be scanning all day, go for the faster option below. 

Entry level option:

Scansnap:http://www.fujitsu.com/us/products/computing/peripheral/scanners/scansnap/ix500/index.html

Good place to buy: Amazon

Faster performance option: 

Faster:http://www.fujitsu.com/us/products/computing/peripheral/scanners/fi/index.html

Good place to buy: Amazon