In reply to nodwas: I looked at doing this 2 years ago. Was wanting to spend 20-22k ish for van and full conversion with poptop.
I looked at all vans and nearly bought a pugeot and then a merc before I came back to a vw t5.
The reason I did not go with the others over a vw was just for one main reason. Resale value.
When converting anything other than a VW the vale depreciates fairly similar to a car, so straight away when picking it up I would have lost about 2 - 4 k looking at sim converted vans. 2 years down the road it would be somewhere around 10 k and worth less the 5 in 6-10 years depending on mileage.
Now looking at t5's I would have made money if sold straight away. 2 years still in equity and 10 years down the line still worth anywhere from 10-15k
That's the reason I bought VW but they are more expensive to run and maintain.
Hope that helps. T