mmm 10k max is a very nice limit, have a look in the for sale section and search up ae86 or sprinter and u'll see what 10k can get you (a lot!)
If your in the field of saving money definatly go for one that's had a conversion already done to it, it usually works out cheaper in the long run unless u plan on doing the conversion all urself and can get parts nice and cheap.
Also, before you commit to any car always check out insurance first, give just cars a call on 13 13 26 and just ask to get a quote, u can also use their website, get both quotes for 3rd party + fire theft, and full comp.