If the 27mpg number is correct - that's probably the biggest game changer. If it can run 35's and still get low 20's MPGs, I'll be interested - even if it is about $10k too expensive.
I have to agree with you, plus 35" would give you another inch plus of ground clearance over stock. I really do hate the abysmal gas mileage I get out of my 4Runner and that's only going to become a bigger liability over the next few years.
Full Land Cruiser trim with the premium package sounds like the way to go for me. Probably will end up costing somewhere in the $70K range I believe.