Why not both?
Big One
http://www.harborfreight.com/garage-...eed-44142.html
Small One
http://www.harborfreight.com/garage-...hine-5980.html
Do note, depending on what your going to do with the machine this might not be a very good option. Your mostly limited to smaller workpieces and some what limited functionality (like you can't use both functions at the same time). Yet, it does come at a very nice price and fits in a much smaller space than separate machines. Yes I know the quality is somewhat poor and its not the most ridgid machine in the world, but for most robotics applications it will work fine.
So if your looking to machine small brackets, shafts, hubs, bolt circles, gearbox plates, and etc, this would do a fine job (given you have the right tooling).