EF 100-400mm f/4.5-5.6L IS $1,438 @ B&H
EF-S 17-55mm f/2.8 IS $1,000 @ B&H w/ $120 Rebate
EF 100mm f/2.8 macro $ 499 @ B&H w/ $60 Rebate
TOTAL $2,938

If you can go a little higher on your spending tolerance, then I would replace the macro above with an EF 100mm f/2.8L Macrro IS at B&H w/ $110 rebate for a total of $3,325.

Pat