Maybe some bottleneck since sli 780 should push your processor to the limit. Otherwise, you have enough graphic power to run all games at near max settings.
if amazon is cheaper and you want to save money then do that but if there is no big difference go with newegg. 34" is a big monitor you might want to be wary of your eyes. I use a 32" smart tv the text is hard to see unless right up close to the tv like a normal monitor. That is pretty much what i got from a tv that big.
Maybe some bottleneck since sli 780 should push your processor to the limit. Otherwise, you have enough graphic power to run all games at near max settings.