I got a 2011 Vermeer BC100XL 49HP Caterpiller 2.2 liter diesel for 12k with 3000hrs
It is much better than I thought it would be. It chips 12inch logs pretty well, and can chip one large branch or 2 smaller branches without lowing engine RPM enough, to activate AutoFeed.
The one large 17inch diameter feed wheel is nice, in that it will easily grab 5inch or bigger diameter branches.
I like how easy it is to touch up the 2 knives with a flat file, every 2hrs of chipping, so it's that much sharper.
One thing that I very much dislike about BC1000XLs, that is a very cheap design, is the fact that they apparently all have only one support arm for the feed wheel, that is the arm, on the drive side of feed wheel.
The other side is just "floating", and therefore does not have place to "rest" when the wheel comes down after chipping a log.
There are "teeth" marks, on left side of the feed table, on my BC1000XL chipper, from the drive side arm "shock bumper" wearing out enough, so the left lost enough clearance to contact the feed table.
Why not think about the this Bandit...
https://banditchippers.com/product/intimidator-12x/
Or this Altec chipper...
https://www.equipmenttrader.com/listing/2016-ALTEC-DRM12-5036151358
Both have 2 properly supported feed wheel arms. And are pretty light weight and could be under 31k
Or, maybe last resort, a really inexpensive BC1000XL They're very common.
One thing I will say, is they do make nice small, even chips, from my experience.