Woohoo! Another 4 Door!!

Welcome to Zukiworld.
Well, I've got a lot of experience with 4 doors, and I seem to be the starter of a lot of waves in here.. so I'll give this a go.
It looks to me like you want to have a little bit beefier truck, but you're looking to do it on a budget? It can be done pretty cheap. What is your goal on tire sizes? How much height are you looking for?
As for a little more oomph, some nice plugs and wires help a lot, as well as a better breathing filter (say a K&N) as well as a larger exhaust diameter. I opened mine up to 2" from the CAT back, and used a cheap turbo muffler, and I saw a noticeable difference.
As for lifting it, check out the budget article I wrote - it's currently mirrored on Zuwharrie.com - until I get it back on my site, then I'll have it there too:
http://www.zuwharrie.com/content/view/11/27/With lifts, suspension lifts do not have anything to do with the bumpers, as they lift the suspension. When you put a body lift on, you'll then have to do something about your bumpers. You can either build brackets for them, OR, I think the Calmini body lift contains the brackets for them. At least the front one anyways. It might be smart for you to just go with some coil spacers.
When you go to a tire larger than about a 235x-30".. you'll start to notice a drop in performance, just because of drag, and gearing. Not much you can do about that unless you find taller gears.
I'm sure lots of other people on this forum can help you out as well.
Calmini, and Rocky Road
www.rocky-road.com , and soon to be Shogun (check the Shogun track kick lift on another post in here) all have lifts for these trucks.
Also, check out my past work done on my truck to get some ideas:
http://www.granitepath.com/friends/kd7hcg/sidekick.htmlHeather