If they release the 860 at the same time as the 880/870, I'll probably get the 860. But if they only release the 880/870 at first, and they are reasonably priced for their performance level (let's say $500/$350 with 780ti/780 performance), I might jump up for one of them as my 1440p monitor will be able to use the extra powah. My guess is that NVIDIA knows that there are a fair amount of people like me so we won't see a $200-300 dollar 800-series card in 2014 unless AMD forces their hand.
I'm curious, what's the biggest performance spread based on the same chip in the last bunch of years of GPUs? For example, the GK104 is in the 760 and 770, right? So in this example, what's the lowest performing and priced GPU with a GK104 chip and what is the highest? I know different generations come into play (isn't GK104 also in 680?) and mess with price points a bit, but I wonder if there's anything we can learn about the 860/870/880 performance spread from looking at what NVIDIA has done in the past.