An AFA 80 with better subs than yours (85/80/85) went for about £1,300 on ebay.com a while ago.
I'd say that's a fair value. From memory, I've seen them go for around £1,300 to £1,600 (which is the same as the Vectis one once you take the fees off).
It's not the rarest Palitoy out there.