Nope.
I had a choice between waiting an unknown amount of time for an NV card with unknown performance at an unknown price, or I could buy a 27" monitor with £100 off, and an HD7950.
I bought the HD7950 on the basis that even if the GTX680 was better/cheaper/etc, the amount I saved by buying the monitor when I did would be highly likely offset the cost difference, and meant I could get things an undetermined amount of time sooner.
End result, I've been using my 27" monitor and HD7950 for about 6~7 weeks, and I'm no worse off than if I had waited, since I could have got more performance with a GTX680, but I would have had to also pay a bunch more money.
I am also better off unless AMD drop the price of the HD7950 a decent chunk (like £100/$150).