I'm thinking of fully retiring my 20D and making my 40D my backup with one of these two as my primary camera.
My work is primarily low light conditions: Concerts, Parties and shows, etc. I operate without a flash 95% of the time but do own a 580EX if necessary. I had been holding out for the 5D Mark II but the more that I read about it, the more I feel like it was a dud. Now that Canon has released the 7D I wonder if I should just keep with the crop sensor and go with the 7D. Money is rather tight, so the 800 dollar savings would be useful, but I could always use that money to add the Sigma 20MM f/1.8 to the lineup, or spend an extra 200 overall and buy the 7D and a used 5D.
Fast frame shooting isn't that important to me. Effective auto focus, particularly in low light is highly useful. Better sealing could be of benefit in the case of a spilled beer. Right now I operate moderately well at 400 ISO, but I'd like to be able to work in 1600 ISO without worrying a *ton* about quality. I do have trouble getting "wide enough" particularly at fast lens speeds today with the 24 being too cropped in for much of the time.
Thoughts? My gut is telling me to go with the 7D, perhaps the 7D/5D combo.
Thanks in advance.
In case it is useful these are the lenses that I'll be using with the camera.
Canon 17-40 f/4
Canon 24MM f/1.4 Mark I
Canon 50MM f/1.4
Canon 135MM f/2
Canon 180MM f/3.5 Macro