Alright, so preface with my system specs to start with:
CPU: i7 2600K @ Stock
Mobo: Asus P8Z68-v pro/gen3
HDD: 2x1TB, different drives, one SATA III other SATA II
SSD: 250GB for OS/Important Programs
GPU: EVGA GTX 680 Reference
PSU: Corsair AX650
I am just on the fence right now as to whether or not I should get a 780 or wait for the 800 series to drop, I am leaning towards waiting for the 800 cards.
I am guessing I could recoup about £150-£200 on my 680 if I were to sell it just now but I am not sure if the investment in a 780 after selling the 680 would be worth it right now considering, inevitably, in about 12 months time we'll have the 800 series cards to play with.