Do your bumpstops last.You should just have a 4x4 shop do your bumpstops. Have them put your VX on a articulation ramp and see how big of one you should use. At least this is what I was told (after I bought some). There isn't any need for bumpstops up front I don't think.....

Look in my profile and you will find the Bilstien part #'s I used that will give you a good idea on what size Rancho to use. I would just stick with your stock shocks up front until they go bad.