Don't buy their 100' cables because that is stranded wire. Most patch cables are stranded and you cannot put that into a keystone. Stranded cable is flexible but attenuates the signal more; it's meant to be placed where it will move around a lot such as between the wall and some device. For something that will not move, you want solid wire because the signal does not attenuate as much, but it will break if moved and stressed a lot. The Home Depot here has Cat5e for something like 10-15c per foot or 1 kft box is around $60. Monoprice has 1 kft box for about the same price.
If cost is a concern, you can get away with Cat5e. Cat6 is not necessary for what you are doing.
Are you actually running the wire inside or through walls or will it all be on the surface?
Surface mount boxes are easier to install, but can be unsightly. These are similar to those gray or white boxes for telephone jacks you may have seen in older buildings. You only need to fasten one or two screws into the wall. Some come with double sided tape.
Example of a surface mount box:
http://www.monoprice.com/products/p...=10517&cs_id=1051705&p_id=2042&seq=1&format=2
If you want to install a wall plate, you'll need to cut the dry wall and put in a remodel box of some sort -- otherwise the wall plate will not be secure. The least expensive remodel boxes are the blue PVC type which I think cost around $1 each. I've seen yellow low voltage remodel boxes for about $2-3 and they are similar to the blue ones but their backs are open. A remodel box typically has two clamps that tighten against the drywall to hold it in place.
If the wire will be on the surface of the wall, avoid using staple gun or metal stapes. Use plastic staples or fiber insulated staples.