Actually the rear tires will be a hair taller, but only slightly. The way the tire numbers work is the 235 or 255 is the width in millimeters, the 75 or 70 is percentage of that width in side wall height, so since the rear are so much wider, that will make up for the percentage differences.
Discount tire website has a handy comparison tool here:Tire Height Calculator
As for wheel options, honest answer I prefer the ones on the van currently. They're unique and you don't see them a ton. Van is clean, maybe just think about having the current rims polished. If I had to choose, I'd go with the Torqs though.