Here's my advise.
If you want a new camera, GET IT! You'll enjoy it and join the rest of us who just like to have and shoot something different. However, if you think new camera will improve your photograph, FORGET IT until you reach a point the reason of getting that new camera is a result of limitation you are experiencing with your old camera.
Granted, with enough skills, you can do just about anything with just about any camera, sometimes gears made for that purpose will make it easier and possible in more situations. To me, that's when getting new camera makes sense. But then again, since this is our hobby, nothing HAS TO make sense. (right?) Enjoyment is a reason enough for me.
As to format, it's really a matter of your personal preference.