I'm in the same boat with you. Been shopping heavy. You can see my thread in Excavators:
https://www.tractorbynet.com/forums/excavators/409745-looking-buy-mini-x-your.html
Right now, I'm leaning towards a late model, low hour dealer-owned rental fleet machine. At the top of that list is a Takeuchi TB260. Open station 2015 model with 900 hrs and a 1 yr warranty for $32K. Dealer installed hyd thumb is another $2500. Or, I can get a new one, with a cab and thumb, for $70. (2 yr warranty and 0% for 48 months)
I just priced the Kubota KX057-4 last week. Local dealer quoted $74K, for cab/air, angle blade and hyd thumb. I plan to talk to a couple other Kubota dealers this week.
Got a quote on a Kobelco SK45SRX open station, angle blade and hyd thumb for $54K. Smooth and quiet, but compared to the Take, the hydraulics are slow.
Deere quoted me on a nearly new 50G (2018 and less than 400 hrs), with cab, angle blade and hyd thumb for $58.
Terry just suggested Ritchie Bros.
Used Heavy Equipment for Sale | Heavy Equipment Auctions | Ritchie Bros. Auctioneers You can check it out. Hope you have better luck than I have. I've been to 3 of their auctions lately, and I haven't bought anything. If you go that route, I would strongly encourage you to go in person and go early. You can (and should) check out anything you're considering. I went to Ft. Worth two weeks ago. Had 27 Midi-Excavators on my watch list. After I had checked them out Monday, I had deleted all but four from my watch list, and made notes of conditions, issues, and what I would pay. I came home without one.
Often, if a machine is offered in an auction, it's because something is wrong with the machine and the dealer isn't willing to sell it himself. (and live with an angry customer) Just saying, keep both eyes open on auctions.