Love my XTi! I would not jump to a 40/50D from here. After learning everything in detail and learning more about lighting I will be moving to a 5D mark 1 whenever I am ready, but this camera is all you really need for a majority of things!
I see an XTi as a Lexus and a 5D as a Ferrari!
). 50D is a Lexus. 5D m1 might be a Ferrari, but he old one 
, now have 400do;500f4is,600f4 

)
