I suggest picking up a reversal ring for your stock lens:
nikon reverse ring 58mm, great deals on Cameras Photo on eBay!
You can get them fairly cheap < $10. You can decide form that if a true macro lens will be right for you.
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Canon T1I, Tokina 12-24mm, Sigma 18-50mm, Canon 1.8 50mm, Tamron 28-300mm VC, Sigma 50mm Macro, Speedlite 420ex
my flickr | MacroReverse.com - blog I run about reverse lens macro photography
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