Most people think the best initial upgrade is headers and exhaust. The LC Engineering headers are good, but most people don't want to lay out the cash for the rest of their system. If you go to their website, maybe you'll know what you want to do, even if it isn't with them.
What I've done so far is rebuilt and balenced the engine, K&N drop in, 2.25" exhaust, and bored throttle body. I've also done the major tune up stuff and fixed lots of little problems (TPS, MAS, Aux Air Valve, EGR). I'll tell you what, it pushes my 33's pretty darn will with stock 4.10's, even able to chip the tires. It doesn't jam up the hills but when I get 4.88's in there, I bet it'll be just fine. All the while, I get 17 - 21 mpg. Short of a cam and headers, I can't think of too much else i could do that would make a difference.
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