I am going to second what Billo said above. Many have the delusion that just because you have a full frame camera you're going to automatically take great pictures, and that's a dangerous and expensive road to travel. Yes, the D700 is capable of taking pictures that you can blow up to poster size, but that is in the way the pixels are designed. I have printed as high as 24x30 with decent detail, although a print size down is much better.
The D700 is for all intents and purpose an amazing camera, but that does not mean you need to go out and purchase one to create amazing images for the internet or your friends. Learn the trade, see if you really need a camera like that first.