well the only stuff there that will really fetch some value is the E6600 + board, the RAM and the 7900GT as well as monitor. The rest of it is pretty much gonna be lowballed for the most part. Computer hardware loses value very quickly if it's used in the slightest and I think $3000 is a pretty high estimate. I would lean more towards $2000 or that area
I might be interested in some of the stuff, I don't want to suggest a price as I don't want to rip either of us off so you can price it yourself and then I'll see