Winner: NVIDIA GeForce GTX 780
Runner Up: R9 290 with Non-Reference Cooling Solution
Let us start with the most concise, epic controversy. The Hawaii GPU is an amazing chip at an amazing price point with a bad reference design. As Josh stated, if the AIB partners had designs ready (and readily available) this year then the discussion would be much different. As it stands, however, the GK110-based GeForce GTX 780 is available at an acceptable price considering what you get and thus gets our vote.

And....
Worst Trend of 2013
Winner: GPU Shortage Because of Coin Mining
Let us face it, it is too late to get rich from mining fresh Bitcoins. Not only is the complexity and payoff getting too troublesome but also many are using dedicated and custom-designed circuits for maximum performance at a minimum power draw. The way to get rich with GPUs is, as a reseller, to inflate prices on the poor suckers who think that an R9 290X will explode their bank account. Stop it and take a few seconds to smell the poop. Microphone... dropped.
Whole podcast for those who are interested.
Incidentally, I subscribe to PCFormat and they gave the GTX 780Ti as 'High performance gear of the year' award and the GTX 770 picked up the 'Mid range gear of the year' award and to top it off, the GTX 650Ti bagged the 'budget gear of the year' award.
GTX 780Ti - "Stunning at stock clocks. Incredible overclocking performance. It's simply as fast as pixel pumping gets"
GTX 770 - "nVidia have absolutely nailed the price/performance metric with the new GTX 770. It's GK104 done right"
Zotac GTX 650Ti Boost - "This is where proper gaming performance begins. The best memory interface at this price by far"