Hi. I have had a Nikon N65 for the last two years. I also have a 50dx speedlight. Today the film door broke on the camera and the store was nice enough to refund me my money for the purchase since there wasn't another N65 in stock. I am interested in upgrading to another Nikon but am unsure of how far I can go and still be able to use the 50dx speedlight. Any help and advice would be greatly appreciated. Thanks!