The pug/shitroen xud is an amazing engine though,their honestly really good cars.
Get a nice mk3 Astra 1.7td Isuzu engined one,bombproof and hugely tuneable as well.
Mk5 fiesta tddi are ok,even an escort mk5/6 td are a good motor too,these are all really tuneable cars as well.
Watch the cambelts on the ford,rovers have just as many elec probs as the pugs and aren't a pretty car either.
Might get a high mile passat tdi for that money,deffo get a golf td (1995/98) mk3 for that money,I'm sure I've read those motors do 3/400000 miles easy and can have massive gains for lowish money.
Tons out there for the money,just eBay tdi under a grand.