Hi Carlos,
I'm using the Tamron SP AF90mm F/2.8 Di Macro 1:1 Lens. It's fantastic value for money - I just checked and you can pick up a new one for $329 delivered from DWI at the moment. I'd consider one of these as an introduction to macro (and as a stepping stone on the way to getting the MP-E 65 lens in the future if you really get into macro). There's more images with this lens on my Flickr photostream if you're interested.
Cheers,
Stephen
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