Help buying an excavator

Have experience with a small John Deere 450 for several years. Have been clearing 20 acres of the farm and think it would be helpful to have an excavator on the farm. In immediate need of a descent stump puller. Property has a typical mix of Pennsylvania hardwood and pine trees. About 40 to 50 year old growth. I've looked at several excavators and realize I'm not smart enough to know what potential issues I may be looking at. Anyone available in the northeast that offers pre-purchase inspection services??
If so, email me at scott AT ingustaindustries DOT com.
Thanks in advance-

Help buying an excavator