I've got a Kangoo van with the DCi70 engine in it and it's really cheap to run.
It's a late 2006 model with all the bells and whistles (air-con/cd/ electric bits.) Cost £5000 inc VAT with 30k on it and a full Renault service history.
Been a really great van, although they aren't THAT big I suppose.
Just done a round trip of 1500 miles going to aviemore and back and it was comfy and did over 600 miles to a tank fully loaded with bikes, dogs and luggage and it's easy to drive and park.
You need to decide on what size van you need really and what your going to use it for.
I'd have loved a larger van, Transit / Vivaro etc; but the missus wouldn't drive them.