There you go. I just used 96% as an estimate. Ever since NV raised prices on its GPUs, this forum started to have a tendency to correlate being an enthusiast with how much money one spends on GPU hardware. Sorry but that's a very shallow and recently made-up definition of what a PC enthusiast is. In the past AT was more about sensible upgrade choices while places like OCN were more about bragging rights, showing off and benchmarking stand-offs. On AT, GPUs such as 6800GT or 8800GT or 6950 unlocked were far more popular than top-of-the-line X850XT PE or 6800 UE or 8800GTX/Ultra or 6970. Hardly anyone back then would defend the high prices of 6800 UE/8800GTX Ultra, and those cards were called out for not being worth it/overpriced. Today $1K prices for flagships and $550 for mid-range are defended. Don't let this affect your GPU upgrade path judgement.
As I said, ask yourself what are you upgrading for? If your cards are fast enough, there is absolutely nothing wrong with you waiting until GM200 6GB/390X or even until 14nm/16nm generation. You can even put your GPUs up for sale and see what kind of offers you get today to get an idea. For example, I monitor what the 7970 goes for in the used market. In the last 6 months the card barely dropped $15-20 in resale, which means I am not that concerned about their resale value at this point. Fairly stagnant resale value and lack of next generation PC games is why I am not in a particular rush to upgrade despite all the hype around cards like 970/980 and Titan X. I would imagine that your Titans are also at a point where it's unlikely that they will lose too much value as NV will not have any high-DP performing GM200 chip this generation.