Get the 40d, Sigma 24-70, a bag, and a Sandisk extreme 3 4gb card.
That is all you'll need for the time being.
Then when funds allow, get the stuff you find you need:
If you want to go wider, there is the Sigma 10-20, Canon 10-22, Tokina 12-24
If you want to get closer, there is the Sigma 70-200 f/2.8, Canon 70-300 IS, Canon 70-200 f/4 or f/2.8 with or without IS.
If you want a kick-ass lens for cheap, there is the Canon 50mm f/1.8
If you want to take pictures in low (or no!) light, there is the redsnapper tripod (which talkphotography members get a discount on) and theres the remote shutter release
Don't buy it all without knowing what you want to shoot. Buy the bare essentials and then go from there.