Hi,
I've ran a couple of Mercedes Vito's and now run a VW Transporter. If you decide to go with a new van, forget the Vito, mine were terrible. The Transporter is awesome, never ever let me down and I do about 50-60k miles per year. Solid vans and nice interior. Mines been remapped too so its pretty quick.
The only thing that has ever let me down was the alarm once but thats because it has too many damn functions on it. This was also an aftermarket jobbie.
Regards