I will be buying some new equipment. I'm just trying to get a general idea of what the more experienced types would take.

What I have now:
20D
50mm f1.8
Tamron 17-50 f2.8
Sigma 70-300 f4-5.6
Bogen/Manfrotto tripod and 3265 Grip action ball head
Bogen/Manfrotto monopod
Canon 220EX
BP511 batteries (2)
2GB CF cards (2)

What I will add before then:
Tamron 28-75 f2.8
Battery grip for the 20D and 2 batteries
Canon 70-200 f2.8L IS
Canon 2x TC
CF cards (at least 2 more)

What I would like to add before then:
Backup body (10D or 300D)
Speedlite 430 EX or 580EX