I ended up buying the Gitzo 2780QR ballhead. B&H got a promotion on them at 269$ + tx and shipping, but I had a ebay seller match it at 279; no taxes (From South Korea) and free shipping. I wasnt elligible for this mail-in rebate promotion so that's pretty much a $60 saving for me.
I gave up on used RRS ballheads since people are asking like $20 less then brand new price. The RRS BH-55 brand new was 575 brand new; $700 with the quick release plate for the D800 + taxes at the border. That was a bit too much for my wallet.
Besides, I see a lot of used Gitzo heads like mine to sell for a higher price then what I paid for it. So it has a very good resale potential if I ever change my mind in the future or get some extra money.