First off you need 3.5 tonne. I'd go for German every time because build quality is great.I've got the 2.8L VW, '05 plate, which I like.I'd also recommend long wheelbase - more room is always good.
Also am I right in thinking that the crafter is the same van as the merc sprinterAnd Renault master the same as vauxhall movanoAnd Peugeot same as Citroen
I reckon 3.5 tonne. I'd go for the 2.8L VW. http://www.trucktrend.com/2003/99/volkswagen/eurovan/gls-van/756