I'm on the look out for a new work van and I'm after some opinions on some vans as I'm unsure on what van to go for.

I'm a chippy and i currently drive a swb mk6 transit and its only just big enough tbh. I don't really fancy going up to a long wheel base high roof van, so I'm wondering if anyone has any views on the following vans...

07 onwards vivaro/master with the 2.0 cdti engine
07 onwards relay/ducato/boxer
04 onwards VW transporter
04 onwards merc vito

I'm looking at a low roof lwb version of one of the above. Fuel economy is quite important too with the price of fuel how it is. Anyone known faults I should be looking for?

Cheers in advance

Gavin.