fasteddy
bought the supported rails here, zapp automation http://www.slidesandballscrews.com/index.php

two 800mm lenghts and 4 bearings tbr16 £98 delivered , this was for the y axis
i have 1200mm lenghts and 4 bearings on the x axis

also bought steppers and the drivers from same

i started building about a year ago and with hindsight i would have build from the solsylva plans http://www.solsylva.com/
i think in a short time you could get a resonably accurate cutting router for very little outlay
the most expensive parts are the steppers and drivers, linear rails are cheap skate bearings

if you look in the gallery on the main page there are examples of machines
and cuts