Check out CNC Zone's Mini-Mill and Mini-Lathe sections. They will recommend you not do it unless your doing modeling plastic, brass or other light materials. They just don't have the power, stability or working range to be of much use for the price.
www.cnczone.com
I'd also save up and get a good used Bridgeport somewhere. Using standard industry equipment will also allow you to get used tooling that's been surplused by manufactures or the government at low costs.
Jim