As you get closer to 3" lift, you can begin to run into other issues. Three things come to mind.
First, at 3" and higher, you begin running out of caster adjustment on the stock upper control arms (UCA's). Aftermarket UCAs may be required to get the front end alignment back into spec.
Here's a great thread discussing various options and benefits of the different UCA's offered.
Second, it's fairly common for there to be contact between the swaybar and front coils. To resolve this, you need to install swaybar relocates. There's no definite way to know you'll need these. My suggestion is that if you're going for 3"+ of lift, you probably should go ahead and invest in the relocates.
A third thing is a diff drop, which is intended to reduce the angle on the CV's. It's the general opinion that these do very little to improve the angle and are not worth installing.