Putting my neck on the line.
I have exactly what you are looking for (but not selling it) boxed, bits and less than 100 pellets through it. I paid Mr Hiller something like £115 (he has been out of the game for a fair rew years).
If it ever goes on the market (ie my widow sells it) I would expect around £140-150.
The gun is big and powerful but with a number of intrinsic weaknesses ie all the plastic and the mazak body (I have just done some 'welding' on one) so good, complete examples are rare.
I expect to get some flak as the gun is pretty unpopular but I hope it helps.
FYI here is one I made earlier http://i172.photobucket.com/albums/w...20147small.jpg