HardOCP says that the 290x will give the same gaming performance for a lower price. In fact, it seemed as thought they couldn't stop talking about how great of a value the 290x was during this review. That is the sense that I too am getting after looking at all of these benchmarks.
http://www.hardocp.com/article/2013/11/07/nvidia_geforce_gtx_780_ti_video_card_review/8
Some other benchmarks which agree that the 780ti is faster than the Titan.
http://www.tomshardware.com/reviews/geforce-gtx-780-ti-review-benchmarks,3663.html
http://hexus.net/tech/reviews/graphics/62085-nvidia-geforce-gtx-780-ti/
http://www.anandtech.com/show/7492/the-geforce-gtx-780-ti-review
http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_780_Ti/
http://www.overclock3d.net/reviews/gpu_displays/nvidia_gtx780_ti_review/1
The 780ti is the fastest single gpu card out there (for gaming). I just don't see how it is worth $300 more than the 290. The 780ti also uses a ton of power. At the upper end of the market, power consumption isn't really much of a concern, but it just seems to me that along with the increased thermal ceiling (83 instead of 80), nVidia was pulling out all of the stops to try to get the crown back. But it also seems to me that the 780ti is what the 780 should have been. Seems like nVidia was pulling punches with the 780 in order to have pricing on their side. They release a super expensive card, the Titan, and then release a nearly as fast 780 at a few hundred less. Well, it is practically a steal (compared to the Titan). Now that AMD has gotten things together and is beating the performance of the 780, they push the 780 in order to get out as much performance as possible. All I can say is that with this tight of competition, the consumers are the ones who win. This card is one hell of an overclocker though.