[ianjmc]

Ian - Yes I looked at the Sony 300mm f/2.8 but the cost puts me off. You could buy a canon or nikon 300 2.8 and a body for the same price as the lens only on the sony mount.

I'll let you know what I end up doing but tbh I'd come to a similar conclusion to what Geoff F has suggested. I'll grab a cheaper body such as the 40d when the 7d starts the flood of second hand bodies. Then I'll blow the big money on the glass and upgrade the body at a later date (perhaps when the 7d has proven itself).