I think:
Canon 100 f2.8 best optically.
Tamron 90 and Sigma 105 about on a par with each other and not that much behind the Canon but cheaper.
The "crop factor" makes a 160 out of the Canon and roughly the same for the others so focal length should be fine. If you want more length then Kenko 1.4 converter (I have the Pro version which is excellent) or Tamron 1.4 would do the trick nicelly and maintain auto focus. Hope that helps. Mike
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