Do you have 3 phase, or are you looking an RPC or VFD?
Common wear items are the bronze bushings at either end of feed rod, and the square centers to the two clutch rods. I'd recommend changing out all of the way wipers, and changing out the felt filters on the two mechanical oil pumps, one in the headstock and one in the apron. The oil lines from those pumps, especially to the ways and cross slide, are often plugged up and need some attention.
The oil pump in the headstock can be accessed by pulling the headstock cover, and the one in the apron is accessed by removing the cap on the left side of the apron.