re: gotta buy a used skid steer bobcat what do i need to look for.

Like stated above, bring someone with some undercarriage and diesel knowledge.
If buying used from rental company some folks we deal with take way better care of equipment.
Don't know your plans (pavement vs dirt) but the track mnachines I have used were great.
Bobcat even had a wide track model.
Made a world of difference working in Avondale this year in the mud and rain.