We've had a Sprinter for about a year and it's been pretty good. It does cost a lot more more than standard cargo van, but itit has advantages also like 2-2.5 times the fuel ecconomy(17-20mpg actual results vs 8-9 for GMC 2500HD) and the 6 ft standing room in the van.
You need to weigh the plus's and minus's and decide for yourself. It probably comes down to how tight your finances are, you'll be looking at about $200 per month more for the payment and about $100 less in fuel cost. We look at the ~$100 extra as justifiable, the only downside is the height for ladders. Whatever you do don't buy the electric ladder rack unless you only need extention ladders, it doesn't work with A-frames.