I'm like you looking to buy a zafira, last few cars we have had were Picasso's had a 1.6 petrol (felt a bit under powered when loaded) and 2.0 HDI which is lovely
I was looking at a diesel people carrier, but I've slowly be put off due to the DPF, as Mrs only does lots of short trips (10-12K per year, but to the shops/school/work )