Please cut it out with the attacks guys.
I will weigh in on a few issues though.
1. 780s can OC very well with additional VDDC or modded BIOSes. They get much hotter though, and require good cooling.
2. At around $400, (if one is to be found for MSRP) the 290 is arguably the best bang for buck, especially if it unlocks and is stable.
3. From my personal experience, the 290 is great at 1600p and with bf4. However, the OCing ability is kinda meh. Whether unlocked or not, have trouble getting it stable past 1025 MHz, or so; not worth it. Memory doesn't want to be touched either. Unlocking may not be completely stable on mine. gives lower hash/s when mining.
4. I am looking forward to a new cooler, when my Gelid Icey arrives. Perhaps I will revisit OCing then, as well as unlocking.
5. Performance crown can shift depending on resolution and game.
Lastly, for those of you with a 290 or 290x, a question: how well does yours OC? How many mV did you need to add? What fan speed do you run? For me, it must be mining stable, and if it for some reason decreases h/s performance, that is a no go.