Welcome to the site.
First off, get the idea of cheapest way out of your mind. Your safety is more important than saving a few dollars.
Do you research and weigh the pros / cons of each kit for you. If the kit you want is more than another, then save for extra month or couple of months. It's better to get what you want than settle for what you didn't want.
Next, you need to decide what are you going to use the truck for, i.e. what types of terrain, conditions, etc. and how far are you willing to go.
Then, you can decide the size of suspension and tire you are wanting.
IMO, a good tire and traction devise(s) can get you places a stock truck can't get too.