OK, I just did my part! Big brown truck came the other day and delivered a 100-400 USM IS L, a 580 EXII, and an ST-E2 and a filter for the new lens. The CC says OUCH! but the fun factor with second 580 and ST-E2 makes the pain go away - at least for now. I never knew how portable and versatile a "light kit" could be!
I was thinking about selling the 28-300 except that I noticed that it is not a bad macro lens with the focusing distance at 300mm. It is quite impressive!
I've done my part this month stimulating the economy.