I ran across this interesting set of plans from Momus. It’s for a DIY bench top CNC router and it looks pretty functional. After seeing what some companies charge for machines of a similar size, I really don’t know why someone would not build their own machine.
While I feel bench top models are too limited in there cutting capacity for my needs, they might fit your project needs. They also take up less space and you don’t need an entire room dedicated to them.
Plans are $20: http://www.momuscnc.com/index.html
CNCZone Build Log: http://www.cnczone.com/forums/momus-design-cnc-plans/189546-alive-momus-2-0-build.html