First of all
When you refer to powerline roads at speed you need to start thinking about a few things.
First of all you have to walk before you can run. Take your X out and do the type of running that you aspire to do and discover the current shortcomings that you have. But you really don't need to start delving into heavy modifications until you find that the suspension isn't keeping up with the speeds that you are trying to run.
The first thing you are going to discover is that the X, as it is currently set up, is too soft for going fast over terrain. The same spring rates and soft shocks that make for a cushy ride on the road don't give you any help on the dirt at speed. You will be constantly bottoming out and the truck will bob up and down even after the most mundane bump.
You can correct this first of all with stiffer spring rate coils and shocks. That will give you more controll and the truck will recover quicker over whoops and dips.In the rear you should look at ditching the stock leaf pack and getting a prgressive rate spring pack for a progressive rate spring pack and longer shackle that will provide more drooo and with appropriatly valved shocks it should greatly improve your performance.
Bigger is not necessarily better. A "lift" that provides you no performance other than the ability to fit larger tires is no good to you if it does not increase suspension travel. The only way you gain proper travel in front is with going to longer arms with correct geometry a taller spindle and correct shock valving.
You really need to start with the basics though since you are talking about a new vehicle with no cage that you aren't going to be taking to the limit anyways.
Then, once you have found that your X is stil overmatched with these modifications you can start looking into reservoir/bypass shocks and longer controll arms to increase track width and