It's worth while spending an hour or so checking yojoe or the Bellomo book to understand the 3 main variations. Version A is concidered the rarest and commands the most money. I paid a LOT of money to get mine from a good seller and it is pretty minty with his uncut FC and all accessories. His black visor can be an issue nowadays as there's some vey good repro's doing the rounds and a lot of sellers just don't know the difference

Normally Version A goes for £120-160+, B & C about £70-90, maybe that sounds a bit much but when I bought mine 2 years ago I was losing bids at just under £200 for the A so it shows that people were paying that amount! Another thing is check the elbows for cracking as well as the groin, both seem to be really prone to cracking.