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The best of those choices would be a combination of the headers, cat, and exhaust... It doesn't do any good to have a high-flow cat if your exhaust isn't high-flow as well (or vice versa)...
The plugs and wires would probably only smooth out your idle, and any other gains from them would be barely noticeable...
The intake is good too, but you can modify your stock airbox to give you a simulated cold-air intake by cutting a hole in the resonator and blocking the normal intake hole with duct tape or something...
But, if you don't have the cash to go with the headers/cat/exhaust, I'd probably go with an aftermarket intake.
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