We use Solid Works which is approx 4k as a CAD package.
We also, although not purely CAD, use Alias and MasterCam for which both have great carry over qualities into the actual machining that we ultimately require. Alias however is 21k per seat ! and mastercam 9k per seat !
A good package that we have come across and played with which can do 90-95% of everything that we need is "1 CNC", this is far more reasonable at around 1.5k.
Nick