Different flavours of PD

Hi,

I'm looking at getting a new (to us) car for my SO, and she wants something safe, comfortable, nippy and economic. The only car that seems to make the grade is the Golf GT-PDI. Preferably the 150bhp version. Unfortunately they are all pretty expensive, so I'm looking at the possibility of buying a 110 or 130 derivative and getting it chipped.

Does anyone know if there are other mechanical differences between the cars, or is it just the software?

Cheers,
Dan

Thanks for the info. I'm not sure we'll end up getting the Golf - for a little of 10k you can get a good A3 1.8T Sport. That would be economic enough and have plenty of go too.

Cheers,
Dan