Go with a VS Series II Calais. Engines ... well you have a choice of the Ecotec V6, Supercharged V6 and the V8 with the Calais. If your mum is worried about the price of fuel, go with the V6 or Supercharged V6. If not, then go with the V8. Either way, it will be a big improvement over the VN. Just make sure that all the things in the Calais are working like power windows, climate control, cruise control or trip computer. Anything mechanical isn't expensive.
Good luck
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