Thank you for the input.
I've been mulling over the Crop vs FF issue as well, but I think I need the higher FPS that a crop gives me due to baseball and football. With that said, does that change the thought behind the approach to which glass I go with?
Knowing whether you will stay with a crop sensor camera or not will absolutely affect your decisions on lens selection. The fine EF-S lenses mentioned above will not work on a FF camera, they are for APS-C only. If you are sure that you will continue to shoot with a crop body, it is not so critical. But the convenience of using your (expensive) lenses on either body should not be underestimated. If you feel that you will "upgrade" to FF any time soon, then I would suggest that the only EF-S lens you buy should be a wide zoom, like the Canon 10-22mm or the soon to be released Sigma. The EF24-105 is an awesome walk around lens on a crop, but for the fact that 36-168mm FF equivalent is not very wide.