If you're looking to extend the range, I would suggest multiple access points over a single long range router. With a single router, that 54 or 130 or 300 mpbs is shared between all devices.

Something like this: http://www.amazon.com/Ubiquiti-Netw...8895924&sr=8-1&keywords=ubiquiti

Just needs a single ethernet cable and comes with a PoE adapter included. They also have a 3 pack if your office is huge.