The hierarchy is 780 < Titan < 780 Ti < Titan Black
The Titans have a 6GB framebuffer, though, so cost as if they were in the top two positions. This is only beneficial for people who are using the Titans as cut-price Teslas, and doesn't make much difference in games.
There's also the option of buying a 760 or 770 and replacing the GPU sooner than you would otherwise. The 760's less than half the price of the 780, and in a couple of years it's likely that there'll be a card matching the 760's current price, but more powerful than the 780, so you will end up with a better system for the same money, but you'll have to make do with a slightly worse card for a bit. It's not like the 760 and 770 are weak cards, though. They'll be enough to nearly max out every game to be released over the next couple of years, and then you can upgrade again with better cost efficiency.
The Titans have a 6GB framebuffer, though, so cost as if they were in the top two positions. This is only beneficial for people who are using the Titans as cut-price Teslas, and doesn't make much difference in games.
There's also the option of buying a 760 or 770 and replacing the GPU sooner than you would otherwise. The 760's less than half the price of the 780, and in a couple of years it's likely that there'll be a card matching the 760's current price, but more powerful than the 780, so you will end up with a better system for the same money, but you'll have to make do with a slightly worse card for a bit. It's not like the 760 and 770 are weak cards, though. They'll be enough to nearly max out every game to be released over the next couple of years, and then you can upgrade again with better cost efficiency.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56