You are looking at only an inch difference between the +2 and +2.5's. If you want some magical number than you really should look at getting some +3 with a 4"inside and 1" outside offset. It is supposed to handle better than a +2 with 1" offset rims because the geometry is better and bumpsteer is reduced.
Otherwise, why do you need the maximum of 50" anyway?
TRX450R...Pulse Charger, 12.25 HH, HotCam S2, KW valves and springs, P&P, UNI filter, airbox outterwears, Woodward fuel screw, Denton stabilizer,ProArmor K/S, Elka Elite longtravel 17" w/dual linkage, Figair airbrushed hood, Holeshot fronts, Razr II's rears, AC Propeg nerfs, +1 1/2 stem, Armidillo skids.
And a very well modded 03 warrior, engine, suspension, etc