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I personaly don't think the price is going to drop that drastic since it does fill a gap in the 700 series. The price of the custom 780 non-Ti cards may drop when 800 series come out though
If you want to do a comparison between top tier 780 and 780ti, look at the classifieds since e Ti lightning is not out yet.
If you are worried about VRAM, I had 2 titans across 3 60hz 1080p and max everything, yes I mean max, In bf4 and was reading a little over 3GB. So 780s should be enough since you could care less about bells and whistles.
Bf4 is screwed on sli ATM, but was running high preset and was reaching up to 200 fps and as low as 100 on a single 780 classified. I thought they fixed the issue then looked at my gpu usage and the second card was at 0%. I sli'd and was getting around 80-120.
Of course I need to reinstall toastys for my single 120hz and frames are usually 110-121 in sli.