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Humayun - I'd recommend starting with something in the order of 100mm FL - the Canon 100, Sigma 105, and the Tamron 90 are all very similar performance. The 180L will give you more working distance, but it's heavy and IMO not worth the extra dough. Plus if you want higher mag you get greater benefit from extension tubes with the 100mm range of lenses, they'll get you to 2:1 magnification.
For lighting, just put a Lumiquest Softbox on your camera-mounted speedlight (I assume you'd have one).
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