I think I'm going to go with the 70-300L brand new and hopefully get the macro lens sometime down the road used at a good price. I know I'd have a lot of fun with that lens, I just want to replace my 70-300 with better glass as I use that lens a lot. Also, the current rebate Canon has for the lenses, the area where it helps me the most is on the 70-300L as it brings it down into my affordability range.