What Car - for my mate?

[C.A.R.]

Right, my mate has been saving his pennies and we have set a date to go car shopping - weekend after next.

Thing is he is trying to be a cheapskate, looking at 206 HDi's with 140,000+ miles on for less than a grand. These are going to be real sheds.

I'm trying to convince him to up his budget to 1500ish as these cars are a bit more decent and sub-100k miles. We can still sell his Micra afterwards for a minimum of £800 I reckon. With this in mind a couple of odd-ball cars have cropped up.
1.7 Lupo SDi - good build quality reputation, know nothing about this engine though
1.4 Polo TDi - again these are pretty solid cars, not as quirky as the lupo and again I know nothing of the 1.4 engine (similar to that in the Audi A2?) they are very very boring though, but I'm thinking the VED will be cheap?

If you want to browse autotrader / eBay within a 40 mile radius of Stevenage (SG1 postcode) and can offer suggestions please be my guest!
Any advice gratefully received...