Why not keep the stock size? You are going wider AND taller. While you're inside diameter is remaining the same at 17 - the size of the wheel - your outside diameter is growing.
Taller tire is an easy way to get a little more ground clearance for a lot less money than a lift. Plus the taller tire provides more ground clearance for the drive train/subframe components as well as the unibody, which a lift doesn't do. I do just enough off-roading that I was inclined to do a 2" lift and go with the BFG KO2s, which I liked on my 4X4 Ford Ranger. But i don't want to give up too much highway performance on pavement or MPG, and I saw that the TerrainContact was top rated by both Consumer Reports and Tire Rack, so I thought the Terrain Contact in the bigger size might be a good way to get a little lift and better offroad capabilty than the stock Geolander G91s. If the Terrain Contact 245-65-17s on the stock wheels fit in the wheel well and clear the calipers and spring perches on the strut, I think I'd get the offroad performance improvements and little bit of extra ground clearance I'm looking for, maintain reasonably good highway performance, and save the costs of the lift and new wheels. That all seems too good to be true, so I suspect there's a problem with the fit or I'd be hearing from others who've done it.
