I bought mine with your budget its 1989 300tdi hardtop, loads of extra bits and chassis only had 2 patches on it and was solid everywhere else. I did the big mistake of not looking how many previous owners it had and lets just say its had a few :doh:
It has fallen apart at a rapid rate though! cambelt snapped a week after getting it not even giving me the chance to receive the one I had orderd already, 2 wheel bearings, cv bearing, diff seal, low range is jumping out, steering box leaks like a waterfall and much more. So i'm in for a fun couple of weekends fixing it. Then again if you don't go green laning or off roading it wont be so bad I suppose.
Now I have had it a while and abused it I do think 'jesus how much I pay' but that all goes away when you drive them as they are good fun and keep you on your toes.
Don't just buy it because it has loads of shiny new bits bolted on it you really need to look at the rust situation (chassis, bulkhead, bottom of doors not to far gone as they seem to be pricey atm. I would expect your looking in the 200/300 tdi conversion bracket for that money.
If your moving to somewhere it snows you should practice lying down on the snow as once you own one if you don't have a big enough garage your probably be in it at some stage if its like mine!