Thanks
@D&D for the summary. This is what I have narrowed it down to as well. If I expect to spend 5-10k on upgrades, looking for a used machine, what would you suggest I aim to spend for the equipment?
@rScotty suggests 50% of new, and find a seller by networking, not public listings.
New, a 310 seems to be about $150k, which would put it at $75k for a good used one, but I see a lot of public listings for $35-50k, but these often have higher hours. Amazing to see a few from '90s or even '80s.
@rScotty, possibly prices have increased in recent years, and a 2015 310 would have only been about $100k new.
So at this point I'm just narrowing down a strategy for age/hours/price range, and how to find a seller.