For hard digging i would buy a CTL not an MTL.
MTL's are better suited to low impact work.
Bobcat machines work hard,compact nimble and are common but hard on the operator and heavy on fuel
Takeuchi machines are awesome, good on fuel, dig like nothing else, a little better than B/C as far as ride noise etc. But they are big tall and tough.
New Holland are in the middle. Great ride, nice cab comfort, economical good digging power a great all rounder.
Case are a case machine do the job but are dated and expensive but reliable
If i was looking around id be looking for a low hr machine at a good deal nows the time.
there are other machines but they are an unknown ie KOM, JCB, JD, Couger just buy the biggest you can afford cos you'll get more done in a shorter time
Just my 2c worth should be some other opinions out there