The Taig micro mill (
www.taigtools.com ) and the sherline mill are both highly respected.. I think harbor freight has a deal on their mini-mill right now, though, 260$ or something crazy. Specs are pretty damn good and reports are fair. Not sure if the HF model is CNC-able, I'm sure it could be (you could CNC your chair if you wanted to badly enough) but the amount of work involved could be "considerable"
I personally own a Taig lathe with milling attachment.
Also - a great place to find X,Y tables, sherline mills, bits, bobs, raw material -
http://www.use-enco.com no affiliation.