Welcome to IRV2!
I had to go look up what that was...a sprinter van conversion. Is it a van conversion or a motorhome on a sprinter cab and chassis?
First of all, winnebago isn't panacea...I know I have one. They have pretty good components but seem to be assembled by monkey's. LOL. There are lots of little issues when they are new, so by now an '07 should have those kinks worked out.
While I love the idea of a sprinter van and think they make terrific travel rigs, I have come to the conclusion that they are necessarily small while costing a lot of money. The fuel savings really doesn't amount to much in the big picture. If you're going to be traveling a LOT and your budget is so tight that fuel cost is an issue then perhaps it can make sense. Otherwise you give up so much space to pick up a few mpg's.
Consider how much you'll drive it. For example our coach is ten years old this year - it has 30K miles on it. Would we have used it more if it got 5 more miles per gallon? No. Would we have been wishing all along that we had more space and slide-outs? Yes.
So perhaps you've got your heart set on a micro coach, but if not consider a class-A but of smaller size. That's what we did and just love it. It can pretty much go where a truck and camper can go, and has lots of living space, great tankage and storage, many of the ammenities of much larger motorhomes, and excellent driving performance because the chassis isn't maxed out. A regular motorhome isn't really any more difficult to drive than a van or a truck. It's just bigger, you get used to it. My b-in-law now drives a forty five footer...who'da thunk?
Class-A motorhomes in this age and 28-32' size are in the 40's and 50's thousands which I'm guessing isn't far off what you're looking at for a van type RV.
Just something to consider while you do your shopping and learning.
Also consider renting a variety of rigs to get a better feel for what and how you'll use one, features you like, space, driveability, etc.