Tom of the three I would certainly go for the Canon 100mm, this is a fabulous lens. The Tamron 90 and the Sigma 105 are good, but don't really compare with the Canon.
I use both the Canon 100mm and the Sigma 180mm, the Sigma IMO is only suitable for shooting nervous bugs or difficult to get to subjects, due to it's long focal length.
I am about to upload 3 images, all flowers, 2 of them taken with the Canon and 1 with the Sigma. They should be in the gallery in just a few minutes.
Harry
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