trying to figure out correct tire size for jeep

I installed a 4.5 rusty's kit and it say i can run upto 32 inch tires. I was looking towards the interco/stl overall diameter on the ssr is 32.5, the O.D on the tsl/sx is 31.6 those two are both 32x11.50-15 and then there is the thornbirds in 33x12.50-15 with O.D of 32.4 my questions is should I stay with an O.D under 32 or can go upto 32.5, and any opinions on any of the tires I might be choosing would be great thanks Derrick

here is some pics of my jeep on 4.5 rusty's lift and 31's and some with 33x12.5 swampers hope this helps ya out -Andy
http://www.cardomain.com/ride/529567/1