I'd also recommend holding each camera that you are considering, and 'playing' with it for at least 20 minutes. YOu'll want to see how it feels in the hand, how easy the menus are to use, and which controls are placed on the body and where. This will make a big difference in your purchasing decision.
For the record, I shoot Canon but prefer the feel of the Nikon bodies... I have a lot of expensive cannon glass (70-200 2.8, 16-35 2.8, 85 1.2, etc) so I'm sort of stuck