Get 4.10's, you'll be geared like the Rubicon's which drive nice on 35's. If you want the gears to be a little more lower (easier take off, better towing, lower crawl speed offroad) than get 4.56's.
Have a play around with this calc to have a better idea of how it will drive:
http://www.grimmjeeper.com/gears.html
Don't forget to order diff rebuild kits (new bearings etc) for both diffs.
I can't remember if it was the front or rear that would need a different carrier, but the shop/website that you are buying from will be able to help you.
If you're in WA, SBR Offroad are a great shop to deal with and have very competitive pricing on what you need and fitting.