IMO I think they same size all around is easier on the budget especially for tire rotation etc. Personally, I'll be going with 275 35 18's on 18 x 9.5 Y2K rims. I hope they fit? 265 35 18's are hard to find and I think 285 35 18's will be too big for the fronts.
the fuzion and hankook tires have a tread patch under 9" so the side walls buldge out not cool nittos bfg's and some others have exact 9" trad patch so they look good ... I see them starting around 113 on tires.comon the tirerack.com you can go to tire specs and get the exact width for them
the 255 35 18 and wider is a size that will safely not roll over on the sides ... and mine are drag radials so I think they should be way wider than the fronts