33" will be pushing it imo. With 35's you'll need a regear. The 2.5 is a reliable little engine, i had mine for 168,000 before i sold it. It did just fine on the trails and wasnt bad around town, got around 18mpg, but prepare to downshift constantly to accelerate up hills and on the highway and forget about passing, especially with 33's and no regear.
I now have a 6 cylinder and while its no rocket it sure beats the hell outta the 4 on the highway and in hilly terrain.
If you needed to save a couple grand initially i would look for a 4 in really nice shape but if you have your heart set on a 6 and you can afford it then keep looking for a nice 6 you wont regret it.