A lot depends on how you plan to drive it. Is it going to be your offroad basher....rocks or mud...or, a daily driver with offroading here and there? A truck like the one in the pic looks cool, but, if you try to climb a steep hill, hope you have a roll bar. Plus, big tires need more power. If you have the half ton axel...dana 44/gm 10 bolt/gm 12 bolt...you will need to up grade axel shafts and u-joints to roll anything more than a 35 inch tire. That is, if you are going to do serious offroading. As a daily drive you will be ok with stock. A six inch lift is good with 35 inch tires. Bigger tires will need more lift or cutting the fenders. Otherwise you may run into clearance problems. Most lift kits up to six inches (suspension) include drop down pitman arms or a riser for the steering knuckle to help correct the steering geometry. The better ones include extended brake lines and shocks. Also, you can get "shims" to change the angle of the t-case the decrease the angle of the rear drive shaft. So, as far as a suspension lift goes six is probley the most you can go without causing any sereous problems. On top of the suspension lift you can always add some body lift.
I would first decide what you plan to do with the truck...then look around for lifted trucks and ask how much they have in suspension and/or body and take it from there.