A very nicely spec’d HP Z800 with “2x Xeon X5670@2.93GHz, 96GB DDR3, 400GB SSD + 9TB, Quadro K620, W10Pro”. Reputable UK refurbisher (I’ve purchased there in the past) and 29 bids. Bidding just ended at a touch under £360, which seems about right — and sets a fair benchmark for future pricing of such a Poser/Vue-friendly budget-behemoth.
Same Xeons as a well-spec’d HP Z600, but otherwise much better specs and a Win 7 serial on the case (because you don’t want to run Windows 10 on an HP Z.., unless you just want a cheap gaming PC — which would be a criminal waste of such a machine).