These amps have a real cult following and reputation for great quality. If they cost 800 quid back in the day you can imagine what they might cost if produced today.
I've only heard good things about them and wanted one myself some years back. If you can find a well looked after example that doesn't need servicing under roughly 500 quid it should hold its value well.
ASUS Tinker Board S - Oehlbach XXL MasterClock - Topping D70 - Chinese RVC - Audio Synthesis Desire Decade - Sonus Faber Venere 2.5