1-My expected profitability in the future
2-Can I get 3K for the rig
selling it locally on craigslist might be your best option if you are going to sell it in my opinion, ebay and paypal WILL eat you alive!
the number one reason why i don't sell on ebay is just that, fees fees and more fees, plus if you offer free shipping there goes more of your money in the trash.
Also, selling the graphics cards individually might make it easier to sell. good luck!! XD