Currently titles aren't being pushed by GFX anymore. Majority of games are indie followed by the (evil) console ports. Outside of that you have Battlefield 3 and that's about it (I'm quite happy playing Skyrim on my 470 with hi-res mod). All the current models at 1920x and below are just fine in all games.
We have to accept that there is little demand for faster hardware, and instead of getting the upgrade itch, be thankful that our cash can go to somewhere else
ATI's 7950 Boast in the UK can be picked up for just over £200. That's just amazing value for such a well performing card. Nvidia isn't nearly as cheap, starting at around £300 for the standard 670 but a good card none the less.
I'm not sure how long it will be until they are quite clearly pushed by most titles. Maybe the new consoles will help, who knows but games haven't become any more realistic in the last few years. Far Cry 3 is pretty but it's not amazingly more than Skyrim was.