I am trying to make a decision between cameras, and wanted some advice. I am an advanced amateur, and would really like to get started with a DSLR, vs my SP570UZ. I have narrowed my choices down to EOS 50d, Nikon D90 or the D300. I have no legacy glass, so I am free to choose whatever brand. I can't say I will have a specific use, I am just interested in any brand as of now. Thanks for your help.