I'm getting a EF-S 17-85mm IS USM and an EF 70-200mm f/2.8 L IS USM .
The 17-85mm because it was offered as the standard lens with my 40D enthusiast kit (and I saw no real reason to reject it).Reviews I have seen indicate it is quite a good lens (for general photography) , the macro setting will be useful for me too.
http://www.canon.com.au/products/cam...fs17-85mm.aspx.
The wide fov should be great for panaramic shots of star fields.
I had the opportunity to play with a 40D equipped with a EF-S 17-85mm at the local HNDs and liked it more than EF 55-200mm
I liked what I read about the EF 70-200 f/2.8 L IS USM .
http://www.canon.com.au/products/cam...2.8lisusm.aspx
The apeture of 77mm is more useful too.