Nvidia GeForce GTX 760 and GTX 750Ti

Solution
I posted so many benchmarks. GTX 760 is higher in performance compare to the 270X. If you are willing to spend extra $20~ for 5-10 FPS increase in performance, get the GTX 760. R9 270X is in $180-200 range and GTX 760 is in $220-250. I'd get the 760.
GTX 750 Ti is a pre OCed 750, and GTX 760 is a more powerful card. R9 270X will compete against GTX 760. Some benchmarks:
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1st, the architectures. The GTX 750 Ti is Maxwell and the GTX 760 is Kepler. The 750Ti has 640 cores and the 760 has 1152 cores.

In short, the GTX 760 is more powerful, but less energy efficient. The 760 is about 36% stronger than the 750Ti (according to http://www.videocardbenchmark.net).

And the R9 270X has about the same performance of the GTX 760.

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