I had bought the second cheapest on ebay 4 years ago, I believe I paid. $102.36 I also believe it had free shipping, the one I got was a one piece 4-2-1 header, was a really big pain to install,
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The headers made a really big difference on the 1.6 engine, another thing I've seen people do is port and polish just the exhaust side since it is a little restrictive, I might be going that route if I don't swap an sr20 into my se,
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I believe there is a ga16 forum I don't remember the exact web address at the moment, maybe someone has some headers for sale for cheap, or a port & polished head even
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Another thing remove your valve cover and check out the wear on the top timing chain tensioner, that's how my engine went