£3900 for a rebuilt landy seems a good price, but I would want a gearbox rebuild & Galvanised (not just new) chassis for that. Seems strange that you'd rebuild not on a galvanised. Not to mention, ideally, a galvanised bulkhead.
£3450 for that clean one is alright so long as its straight and original, un molestered and basically perfectly original.
When looking at series its important to bare in mind the things that matter are generally the things that make no difference to the look of the vehicle! Bulkhead, chassis, gearbox & engine have no impact (bar bulkhead rust in places..) on the looks of a vehicle. But if your forking out £4000+ for a machine, in 10 years time you want one that will still be solid and not needing welding and goodness knows what doing to it. (face it, even a perfect resto rebuild is still going to need to constant work, but not structural). Yes, a decent spray job and 'straight' panels make the vehicle more desirable for the next few years, but a good chassis, solid bulkhead & gearbox (engine less so, easier to get hold of decent engine than gearbox), make the vehicle more valuable in 10 years more time.
On a side note, are series genuinly going for this kind of money?! because when I started my rebuild last summer, I swear for £3900 you would get a show quality vehicle with everything rebuilt - rebuilt gearbox, engine, steering box, axles, springs etc. Not just a chassis rebuild and resprayed engine oh and 'complete bulkhead repair' - as with the one above. They would have gone for about £3000..unless i'm way off. Please someone reply to this - as i'm not sure my memories right! Surely the demand and value of these old things hasn't shot up that much in the space of a year or two..
Matt