Selling series 3 for 200TDI 90...

I've had a petrol series 3 for a while now, and as much as I love it, I'm thinking of swapping it for a 200tdi 90 since the series is horribly inefficient. I was looking at 200s since apparently theyre fairly efficient (compared to a 2.25).
I was wondering roughly how much I could pick up a good running 200 90 for (not too fussed about body condition, just running gear) and what are the things to look for when buying?
And is something like this and this price a bargain or a load of sh ite?

http://cgi.ebay.co.uk/Land-Rover-90...14&_trkparms=72:1683|66:2|65:12|39:1|240:1318
Also, as I'm new to all things diesel powered, what's the tuning potential (if any) on a 200tdi fender?

Cheers guys!

with that one on ebay it didnt meet the reserve and i would guess he would have wanted between £3k -£3.5k for that,he dont sell **** tho just check his feedback..
as for what to look for basically look for what you would have looked for on the series.you can add bigger intercoolers and silicone hoses and turn up the fuel pump on the 200 all of which will improve performance,but you may end up with a lot more black smoke if you overfuel too much

Reeto then, but reckon £2500 would get me an ok running 200 90 then or am I been a bit silly?