I just purchased a Revenge from Mars from mark C. I bought the machine unshopped.
All I had to do, was change 3 x lightbulbs, add 2 x new slingshot rubbers, give it a clean and away it went. Everything else worked perfectly.
I did have to change the CPU fan which sits on the heatsink on the computers main board. It cost me $20 from Jaycar to replace, took 1 minute to change it over.
The pin2000 setup , with its self diagnostic visual servicing, showing everything you ever need to know on the 19inch crt monitor, is a really esy tool to do a start up service fault check.
I believe Mark C has several really good RFM's in stock, as well as a few Star Wars Episode 1 models as well.
check this video out, the Star Wars is also a dam fine machine, n lots of fun.
and this revenge video showing how computer works etc, its also a great watch