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Titan's performance was unparralleled back in February. But you'd be mad to buy one now.
1.5GB on the 580, regardless of money saved is just too little now. for 1440P performance two Titans opens up a lot more options such as more SSAA/ MSAA. So it's definitely a worthy performance increase. Whether or not you think it's worth the cash is your prerogative though. You don't really need all 6GB VRAM at that resolution.
Scenarios besides compute that the Titan holds over the newer cards is obviously 4K, and surround resolutions.
so maybe sell the titan and get a 780ti ..
If you have just bought a titan dsr it now
2 x 780
There must be 1 graphics card that can run any game at its highest setting at the highest std monitor resolution?