If thinking of 770, get the 280x 3gb... good for ur gaming needs.
As for i5-2500k, still useful for nw, but i think u need to change it at least from next yr onwards le.
i compared the price of 770 4GB vs 280x 3GB on Amazon and saw that the 770 4GB is selling cheaper (US$380 for 770 compared to US$400 for 280x). Been reading comparisons online and it seems that on average, 770 gives slightly higher FPS compared to 280x, but otherwise, their performances are almost identical. Hence I decided on 770 instead. Question now is 2gb or 4gb
I agree that the 2500k is still usable now, but I don't want to change my motherboard and processor next year if ivy bridge processors are not available. Rather upgrade now, and save the pain of upgrading motherboard, and hopefully no need to worry until 2, 3 years later when a new socket type is out. Meaning I'll like to skip over the current Haswell, Broadwell socket, and the two options now are to stay with my 2500k all the way, or upgrade to an Ivy bridge now. Not sure which is better from a money-value point of view.