Good luck with the sale of the V8 and your quest for a series 2/3. Why are u selling the V8?!! I had a V8 5L LHD Bronco which I sorely miss even though now have my series 3...
Anyway, this link might be helpful in respect of series 3s, but possibly a bit basic for you; there are bits on there like: "in summer they can get quite hot" lol (tis a start tho). The prices are old (2006).
I suggested to another poster to check out Land Rover Owner International mag for their price guide but the Beast of Bodmin said it was only suitable for picking up dog ****e, however I found it reasonably useful although you can find decent runners for a lot less (mine was dirt cheap) and of course very much more.