Aaarrgh... you guys are killing me! Four responses with four different combinations.
We have: Kaipu with the simple but sweet Canon 100mm 2.8 Macro.
LordV with the Sigma 105mm macro w/Jessops Extension tubes.
Racketman with the Canon EF-S 60mm macro, Jessops tubes, and the occasional Canon 25mm EF-S tube.
And last but not least, Bald Eagle with the Super Wide/Telephoto/Macro Tamron 28-300 with extension tubes.
You guys sure made it tough, but I decided to go with the most versatle, though slightly different combo:
Rebel XT - Sigma Zoom Wide Angle Telephoto 28-300 f/3.5-6.3 DG Macro - Kenko Extension Tubes.
This lens reviewed sharper than the Tamron, nearly as good as an L lens up to about 200mm, but with occasional focus hunting at the longer ranges. I can live with that, if true as my S2 with a TC tends to do this too.
Thanks for all your help guys. Should have the new toys by Friday at the latest. Bring on the Macro Challenge! 