my 1988 has PaS (90), the 200TDi is the choice for motor, but you will pay more for one with it fitted than you would buying it seperately and fitting it yourself ( a fairly straightforward job so i've heard ).
Economical as a 2.5TD? It depends on how you drive and what you use it for, personally i use a mix of veg oil & diesel and it costs virtually nothing to run but i did change a few bits first to be sure ( filter, pump & injectors ( on their way! ) as well as new glowplugs soon).
To fill my tank up costs me £20 in diesel, the rest in veg oil which has been filtered a few times and other than taking your time starting her, she runs very well.
Yes i sit on the motorway @ 60mph with the wind behind me, but it doesn't bother me, again it's how you drive depends on what engine you want. I would love a 200 or 300 in mine but atm I'm a poor fooker due to unforeseen bills landing on my lap, but that's life
Check the chassis, it's been covered here loads of times on how to, check the docs, check the owner, and get as much history of it as you can. I bought mine and it is in good nick but the list of stuff i want to do to her is huge....but that's the fun of owning an old 90
