I am just wondering your thoughts on my dilemma.

The other day I was traveling on a train to work. The train ride is about 20mins. I noticed a man drawing/sketching. He is a construction worker, with all the persona to show that he worked in construction (tatts, hivis jacket, boots etc). With a sketch book and a black pen (the type you get 10 for two dollars at the local supermarket), he sketched a fantastic drawing containing a picture he had clearly envisaged. His tools are sub-$5 but his drawing is great. Showed light and perspective quite clearly with only one pen and one colour. 

This emphasized that tools are only 20 percent of the effort for art — the rest is my skills and talent.

Now my dilemma; I am thinking about purchasing the D600 for (~2K). Nice camera and all. But really my D80 will do. I haven't produced award winning photography with the D80, and I won't with the D600. (I have just purchased a 80-200D f2.8 and lined up a 24-70 F2.8D ED, second hand).

Is it really worth dropping 2k on the d600 (travelling to the US soon, so I would us it for this trip), or should I await for better photography from me before I go ahead. Or will this body make me a better photographer?

I have run into the limitations of the D80 on some attempts. 

*Really*, am I just a spoilt, greedy, selfish person or is there some justification for purchasing the new body, when i am not a top line photographer. I am not talking about the price of the D600, but the *concept* of buying the new camera when I *have* a good old camera. (Consumerism at its height.)

Thoughts and flames at 10 paces, I would love to hear some ideas and thoughts.

**UPDATE** Just bought the D600 body. Thankyou for your permission to purchase ;) 
This thread was not about to be about the money but on the philosophy of buying more kit whilst (technically) the one you have is 80-90% there. I must admit, I am looking forward into using some of the new functionality. Thanks All, for the varied opinions, and great insights. The final decider is the photos I want to do I just could not do with the D80. Get through the guilt and get on taking photos.