Their all valid points mate.

But this jet is running out of fuel, the markets propped up by major speculation at the moment, serious algo-bot trading and pumping up, it's going over the cliff with nothing left under it's feet, and when people realize their buying into the top dollar bag holding club, there will be a change in direction. (in my humble opinion).
I always feel like the relevant information from that graph comes from it being integrated. It gives a whole new meaning to it.
That being said, I think we are overbought and $600 sounds right.