Looks like NVIDIA currently can't scale performance up as the TDP, only lower the TDP for same performance.
Maybe they're reengineering the GK110 chips for lower TDP.
If a 780 is getting cheaper to buy and maintain, I'd want to get it.
Don't know why people are the I-dont-care-about-TDP-only-performance type. I personally think a lower TDP would result in significant savings in the long run(might even pay you back the price of your card in its lifetime).