If you've got a running machine for under $500, you're a lot better off than buying a Silvia. I'd make sure that the "brain" is working, as that is an expensive part to replace. Similarly the motor/pump and flowmeter can be expensive.
It's a 120 V machine so you won't have to run dedicated 220 V power.
http://nuovasimonelliusa.com/older_models.htmlhttp://nuovasimonelliusa.com/part_kits.htmlResale prices on commercial equipment sort of falls into a few categories:
- Daily drivers -- 1997 Toyota Camry; Runs great, bottom of the depreciation curve, they work (I'd put the MAC here)
- Just off lease -- 2008 BMW; Steepest depreciation is over, generally well-cared for but driven hard, still in high demand (A recent La Marzocco Linea comes to mind)
- Classic -- 1964 1/2 Mustang; High appeal to a wide group, moderate availability, cost driven by a large number of collectors (Faema levers, E61s, Cremina, La Pavoni)
- Unique -- Lotus Super Seven; Only a few know they exist, fewer have even seen one, they seldom sell, and when they do, who knows what they will go for (Faema Marte)
Oh yeah, then there's "Junk" -- either non-restorable or not worth the time because it won't even be a decent daily driver.