D4 is an awesome body! But it helps if you have all top end glass for it also. It also depends on what you are going to shoot with it.
I am a little confused! Back in March, you said you were going to get a Canon 5D MkIII? And you stated you had a 5DMKII and lots of PRO level Canon Glass.
Prior to that you stated you are (or were) shooting a D300 (with PRO Level glass) and wanted a D700?
Just trying to clarify.....