You dont need to buy a "kit"... You might not find what you are looking for. Lots of people mix and match, and approached font and rear differently.
Understand what you want, and go from there. You should give more information about your intended use / application and expected result.
I use my rig off road often... and I had a tight budget. I wanted good parts, so I decided to install it myself... Whatever I ended up saving in labor, I put into better parts and a few tools for the garage which I didn't count because I look at tools as an investment.
I spent under $1250 shipped for everything...
Bilstein 6112 front (2.5" coilovers)
OME 260lb 2" rear spring for some added load carrying
5100 in the rear, which I will change soon.
If I went with a 2.0 from ICON or the 5160 I could have been right at $1500.
That also included a pair of super bumps in the front.
I have a pretty nice and level 2" lift and ended up with an amazing ride on and off road. The 2.5" 6112 was the single most impressive "budget high end" upgrade. I highly recommend it.