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canon 40D is the next camera after mine canon 30D. It appeared in August this year. The review I read seems to approve the camera. :) I have a friend of mine that will buy a canon 40D too..

Canon MPE-65 is rather hard to use! Not just lightning issues but handling it. ;) I have a similar setup when I reversed a 50 mm lens on my Sigma 105 mm and it is not easy. You can see some photos here: www.flickr.com/om.... They are all mine.
I advice to buy a Tamron 90 mm instead a Sigma 105 mm lens, it is a little better (ok, the working distance is a little smaller) because delivers crystalline photos.
I use usually jpg format, but the RAW files are much better because there is no lack of information. jpg file compacts the information, and it has the disadvantage to loose some quality.


The first lens I will get it is a MPE-65 mm and then maybe a Sigma APO 150 mm. :)