Don't be an idiot, your card's fine. Wait x
months for games that need something better than a 280
Seriously. I've been rocking my 295 on this rig and a 280 on my second since they were new. It made sense then, when there were games that could really benefit from a 200 series card over the x1950 I was upgrading from.
These days, there are like... what.. 6 games in all existence that an overclocked 280 cant max at 1080? 2 of those cant be maxed by anything anyway, and the rest just kind of suck.
Wait a while... If big developers move away from their console exclusive direction and start making games that really push PC hardware again... THEN upgrade. You will get a much better card for the same or less cost then than buying a top of the line card now that will be sitting at 30% usage in 90% of current games and wont be able to run new ones when it actually matters.