Tire combo

Backspace/offset of the wheels can make a difference on what you can get away with. More of the tire to the inside, the taller you can get away with.
I'd set your current front tires as close to the front edge of the front wheel well, see how much clearance you have now, and decide how tall you are willing to go. I think your Duster has more room than say, an A-body Barracuda.
I'd try to keep the front diameter at 26" or less
(Both sizes mentioned are 25+inches.)