Now I changed to an E350 Quigley. Reasons are on my website also. In a nutshell: little more room. Way more power. More comfortable to ride. Way more configurations possible like: gears, power, tires, suspension.
I am temporarily living in Austin, Texas right now, and returning back to Ukraine this summer. I had a chance to drive a Quigley Ford E350 conversion van (the luxury conversion, not a camper though) - and I LOVED it. With a diesel engine it has a decent mileage, many truck accessories fit for off-road use and it is extremely comfortable, however - I don't feel like it's something I'm ready to drive around Europe, too big of an investment for me.
My budget for the expedition setup (vehicle, gear, preparation costs) will be around 15 000 Euros total. But it's negotiable - which means, that if I will find something I really like - I'm ready to invest in it. Afterwards - I will continue to work as a freelance programmer on the road.
There will be another person with me, one of my friends, who will also do freelance jobs online, while travelling, so we will be able to afford proper maintenance and long-term trips.
As I said before - our trip will include literally all of the European countries (basically EU) + Ukraine, Bulgaria, Turkey, Georgia and Kazakhstan.
Which means, that we will face a legitimate amount of off-road (or really bad roads) during our journey.
I am a mountain biker, rock climber and kayaker, so we will need to cruise in the remote areas of Alps, Carpathians and Caucasus. During the winter we will often do skiing and sledding, so we will face a lot of harsh snow. During our Kazakhstan part of a trip we will face many desert roads, and long distance travelling.
Taking the above conditions to consideration - a Mercedes Sprinter would probably be too bad of an off-road vehicle for the conditions, that we will meet, with river crossings, mud, mountains, deserts and stuff.