First off, what kind of off roading do you do, and what size tires are you planning on running under the lift?
At 4.5" you'll likely need lots of additional hardware that you MIGHT not need at 3".
Here is a good selection of kits to look at:
You should also consider starting with a shackle relocation bracket / extended shackle for the rear.
One of these kits is easy to install but can add up to two inches to your lift.
Another kit doesn't add to the lift, but it requires cutting away the factory shackle pocket, and possibly welding.
If you do ANY kind of off roading you should start with tow points and skids (trans and or engine).