A G0704 or PM25 would do that volume.
You are going to spend like $2000 plus the cost of the mill for a basic conversion. I'm sure you can do it for less, but realistically if it is done right I think $2k is about right. It will be a grand for the ballscrew conversion kit plus the cost of the control and various other bits. If you want to get a bit more thorough, for example some sort of enclosure, coolant, spindle motor, power drawbar, etc., you will spend more.