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You'll find that most of the headers you can find are designed the way they are to fit inside the engine bay or to work with the stock downpipe or something, not performance. Exhaust is hotter and under higher pressure than atmospheric, so generally you want rather long headers compared to stock for any reason.
I would just buy a budget header that the go-fast crowd has had good experiences with (they'll post dynos and stuff) and the worst that could happen is that you save a little weight and you gain a couple horsepower. Stock headers suck, period.
If you want to go "variable", one thing to try is a throttle plate inside the exhaust. Honda did it on a motorcycle before I believe, it adds restriction but gives them the ability to tune the harmonics a bit to prevent reversion.
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