Canon Macro Lenses. What are you using?

[Reef_Geek]

If anyone is interested, I could be convinced to sell my Canon 100mm macro f/2.8 (not IS). It's $650 plus tax when new in stores... my lens is mint, would accept $550 or a trade for a fisheye (Canon 15mm f/2.8 or Tokina Canon mount 10-17mm f/3.5).

I have this macro lens but am also quite happy with the results using kenko tubes on my 50mm f/1.2L or my 70-200mm f/2.8 L w/ IS, hence the 100mm macro is redundant.