If I were in your shoes I would:


1)Keep the 15-85 and sell the 18-55, unless the latter is still needed for something (small size and weight). The 24-105 is likely to be not wide enough.


2) Get the 50 and 70-200 in the meantime, like planned.


3)When the time comes sell the 15-85 (and possibly the T2i) and get a full frame body and the 24-105 oranotherfull frame lens (24-70 2.8 IS??)


My 2 pennies...