ryan and everyone else,, i think you'll be disappointed w/o OD unless you rarely travel the hiway. to put into perspective i have 4:10 and 37" tires, on the hiway i have played around with what a four speed would be like for you guys to avoid the expense. anything above 60mph and its vibrating and buzzing ready for the upshift a couple hundred RPM's ago. with something like 31" tires it'll prolly start buzzing around 50mph, with 33's prolly about 53mph. its definitenately doable, i have cruised it a bit in 4th gear like that just to see, that turbo is really screamin' at those rpms, sounds cool, but its just beggin for me to shift, when i do its like a little piece of heaven, turbo whines nicely, exhaust hums a little ditty and my smile can be seen for miles.
BTW, this past w/e marked my 3rd road trip now, this time it was just shy of 190 miles and included an afternoon of wheelin, the whole trip including half a day of loping along a trail claimed a whopping 1/3 tank of fuel, my wallet gets lonely on these trips nowadays.