a search for "motion offroad" should bring up info you seek. there are some passionate responses from both sides and I'd kinda prefer not to bring up the bad blood all over again.
if you don't need 4.5", don't do it. the higher you go, the more headaches pop up. all you need right now are better shocks (pretty much anything that's gas charged should be fine but the more you spend, the better they are) and longer control arms to get back your caster and recenter your tires in the wheel well. Oh, and I'd do something about the brake lines if you haven't already.