You should check out DOC
http://www.docmachine.com
You won't find a better control than their Rubicon (Numeryx).
If you don't need HSM (I don't know why anyone in buisness of making money with their CNCwouldn't) except maybe a guy in his garage or something...
If you just can't go for the best control try:
http://www.sdecnc.com/control.html
Or a Centroid is really low cost...
DOC is right in your neighborhood though, thats a good thing...
Sincerely,
Scott_bob