Personally, I was advised by a mechanic a while back. Look at what the taxi drivers use.
My previous motor was a passat, great motor, just needed bigger for work. I've had a Vito for the past 5 years, love it. Paid about £5k, no major issues, now has 315K on the clock. Hoping to trade it in for a newer model next year, if we get a good SCRAPPAGE scheme with this ULEZ