For about 100 hours/year it will cost about $10,000/yr. You'd have
to buy into a partnership or a twin to significantly move the cost
up or down.

More importantly you have to be ready to spend $1000 with no warning
without flinching too badly. You should be able to absorb a $20,000
cost (like a rebuilt engine) without becoming destitute.

If you move up to a twin turboprop I think you just multiply all those
costs by 20 or so.

About right - my partner and I budgeted 450/mo plus gas/oil each for
an Arrow. That did not provide for an engine reserve and ultimately
turned out to be not quite enough.