Im happy with my wildman custom tunes. Its nice being able to shift on the fly and there are different tunes for towing, racing, high idle, economy, ect....
Are you running an auto or a hand shaker.
^^ what he said. Or what anyone else said. Every one that responded is right.
Getting a better flowing intake is probably the most important thing you can do. The factory one is small (doesn't trap dirt effectively) and flows poorly. Just about any cold ait intake (CAI) will work. Some are cheaper than others. Or you can get a Napa 6637 cone filter and replace the filter box with it. It works well, and it's reasonably cheap ($70) compared to the whole CAI system (~$300). Getting a 4" exhaust would be best (~$300), any brand will work fine. 4" is plenty, I push 550 RWHP through 3.5", so a complete 4" system is perfectly fine. Or, cut out the muffler and replace it with a straight pipe, or a straight through type muffler.
Gauges would be really nice, but not strictly necessary unless you are racing or sled pulling or some thing. I have gauges on all mine, and I *rarely* see anything hot enough to matter, and trust me, I am a *lot* harder on my trucks than most people. Basically, don't hold your foot to the floor for more than 10 seconds and you will be fine. If you were doing a 1/4 mile pass on that truck it might take, say, 16 seconds, and there you would want a pyrometer.
Having a trans temp gauge (for an automatic) is nice, but not strictly necessary. If you are getting stuck in sand or mud, and trying to get out, then you should have one. For towing on a hiway, not really. If you are doing lots of stop-and-go with a heavy load, maybe.
A boost gauge is really not important unless you have modified your turbo or something. The stock system is limited to 17psi by the computer, so it won't really matter if you get a gauge or not, it will never get high enough to hurt anything.
As far as the Evo or the Whatever it was you asked about, the other guys are right.. Neither.
You can actually end up spending less on a custom chip, and get waaay more from it. And it is better for your transmission than any of the "canned" tunes you get from Superchips, Diablosport, Bullydog, Edge (Evolution), etc.
Raul at Stealth Automotive (he's a vendor here) sells Tony Wildman (TW). I have experience with it from my brother running it. It works *nice*, and he transmission shifts great.
The others are Power Hungry Performance (PHP) (I think they are vendors on this forum too). I haven't used them but they get really good reviews.
Swamps makes them too, but I don't know much about them. People that use them say they like them.