Also been looking at the possibility of a van lately - here's what my local van company said:
09 plate Vivaro, versus 04 plate Transporter - same money, 08 Vivaro 40+MPG, transporter 28 MPG - Vivaro 20k miles, Transports 70k miles - Vivaro, air con, leccy windows, mirrors, transporter - steering wheel and radio. Vivaro - racking cheap and available - transporter, pay money for it as it's a lot rarer 2nd hand.
All in all - he has an 09 plate Vivaro SWB with the 140ps engine sitting on his forecourt with 7k miles on it (hasn't got the elec windows or air con) for £6.5k plus VAT in red, plus a year's mfr warranty still. He also has an 05 plate Transporter sitting on his forecourt, same money, which has less, is only 80ps or so, has done 90k miles and no manf warranty - it looks tired next to the Vivaro too. I can get full Bott racking put in the Vivaro for £300! - or if I can wait, he can prob find the racking for a transporter but will be £650 plus VAT min, unless I want his guy to do ply racking at around £500.
The Vivaro has a little more room too - up front AND in the rear. The way I look at it, that's a Vivaro on cheap money - he has a load of Connects, astras, and so on - and Combos - but they're all tiny next to a Vivaro. And with a side loading door, the little vans become impractical - and without, you have probelms reaching the back unless you plan really carefully.
I know what I'm aiming for.....