Dude, you got a pretty fair deal. I paid $2,500 for mine about two years ago. But the 12 megapixel, non-video enabled overrrated D700 is STILL going for a good price ($2,300 I believe) so thank yourself for getting the better DSLR in my opinion.
I had the D700 first, caught it with 250 shutter actuations on Craigslist for $1,400!!! The seller had too much money to know what to do with it. Because I was first to respond, he sold to me for less than anyone was offering to pay. Keep in mind this was in early 2010. I sold the D700 on ebay and made about $800 off of it. What did I do with the profit? Bought the 5d2 and 35L. Lovely, huh? Anyway, unless you wanted to pay $3k for d800 or $3,500 for 5d3, the extra dough can go a LONG way towards better glass. Have fun and master that fine machine you have. I am nowhere near squeezing out its potential.