Sethgun,
A 2 inch lift
will do the job however you may experience some slight rubbing in situations such as full articulation and full lock.
The advantage of going only 2 inches higher is that you will maintain a low centre of gravity and with the spacer kit allow you to retain the factory ride quality. It will also lift your sills a further 2 inchs from the dirt.
It won't give you increased wheel travel though without fitting longer shocks.
I have a 2 inch spacer lift fitted to our project JK for testing at the moment and am very happy with it - I have also fitted longer shocks, extended rear links, swaybar double disconnects and brake line lowering brackets which has given a nice increase in wheel travel whilst maintaining the factory ride and keeping it very stable in the hilly stuff (especially after my 6 inch lifted Patrol)
I run 33's which don't rub at all, that is with stock rims too
PM me if you need anymore info regarding the spacer lift it.
Cheers,
Phil
http://ozadventure4x4.com.au/?q=node/16