I was thinking the same thing about the GTX 660, but under some certain circumstance in context, I cannot disclose why I really sold it because it would be embarrassing It was essential that I sold it at that time. I was actually planning to buy an R9 270X 2 months after with the proceeds from the sale + some extra, but I ended up spending the money elsewhere
Well the R7 265 does beat the GTX 750 Ti, and may be a close or on par with a GTX 660. It's priced the same as the GTX 750 Ti so it would do better.
To cut the long story short, I don't think getting a new high-end mid-range card, namely the GTX 760, would benefit me much given the circumstances. I think I'd be going with somewhere between a GTX 750 Ti and an R9 270X. The R9 270X is really overpriced here but I'll try to find some cheaper ones I think the R9 270X performs close to the GTX 660 Ti and is much cheaper.
The $100+ difference between the GTX 750 Ti and the GTX 760 for me is not really justifiable. To be honest, I had a hard time selling my GTX 660 so what more with a more expensive card. So it all comes down to the R7 265 and R9 270X (I don't think getting the middle R9 270 would be great since it's close to the R9 270X, so why not push it?). If I find a great deal with the R9 270X I might get it right away. How do I get those free games anyway? Both AMD and Nvidia are giving away games with their GPUs.
And I don't trust 2nd hand part vendors. Its like that something where you want yourself to be the first one to open the box thing and I don't like the idea that they might have overclocked it a bit...
Most of you guys haven't upgraded your GPUs too. You guys waiting for Maxwell or something like that?