Hi Ant,
Sometimes it is false economy to get one that requires full refurb if you have not done it before. Trying to locate all the missing items, etc. take some time and cost.
I would look at one that is fully refurb or that requires only minor refurb if you are non technical. You could always get one that is operational firstly and then get a do'er upper for your next one. Then if you don't want 2 get rid of the first one...............................
This is what i did but now have 3. My first one is now being refurbed and modified to become 24v conversion, but have 2 working ones that I have now refurbed fully.
Depends on your location but BooBoo (Karl) has refurb one regularly based in Crawley and Chas (Nottingham).
Thanks Lance