Use a tire size calculator like this one
. I'm not quite sure what you're asking but I think you're asking if your rim width would be ok with bigger tires. Either that or you're looking to go between standard and metric. Am I correct?
Just a side note, I love those tires, they do great everywhere I go (interested to test them out in snow and ice).
If you're worried about the rim width and you're going to a significantly different tire size, Tire Discounters has a book that estimated rim width by tire size and that helped.
I notice you have 17" rims. Tires get pricey in that size. Look into 15" rims and it may be cheaper to buy all four or five tires mounted and balanced on new 15s. My 30x9.50x15 Generals were $132 each, and a rim should be about $50-100, plus you get rid of the trash can lids I see on a lot of JKs.
Keel in mind that a bigger sidewall will be stronger and take damage better, but the extra rubber flexes and handles worse than a more low profile tire. Even if buying all new rims is more expensive, you might save in the long run on your next set of tires being cheaper. It's all about how you shop.
As for other tires, look at Cooper Discoverer A/T3, and Dick Cepeks.