How much could I sell my PC for?

I have a good gaming PC that I'm interested in selling as I no longer game. The specs are as follows:

Core i7 950

12 GB ddr3 1600

Evga gtx 680

Asus saber tooth x58 mobo

I have two HDDs, one is 2tb and one is 500gb. It's in a thermal take armor mx case. I'd throw in my monitor too which is an Asus 1080p IPS (I think it's 21.5 inches) and my mouse and keyboard which are really nice gaming thermaltake gaming ones (I forget which models but id figure out when I sell it).. What do you think I could sell this all for? It's just been sitting around but it's a great PC.

600 if you're lucky. Honestly you'd be better served just holding on to it and using it for the next seven or eight years. Save money down the line.

Between 300-500$