Contemplating Graphics Upgrade

[pwest15]

So I recently upgraded my case to an NZXT Phantom 820 fully occupied with fans. I have thus noticed the the ambient temperature of the case is extremely cool. Because the case has so many spaces for fans and cooling, I began to ponder water cooling my graphics cards.

 

My Specs:

 

CPU: i7-2600k at 3.4 ghz. (Willing to OC to 3.8 GHz if it bottle-necks an upgraded graphics card)

CPU Cooler: Corsair h110

Motherboard: ASRock z77 extreme 4

Power Supply: 1000W

 

Current Graphics:

 

Two EVGA GTX 560ti's SLI'd  (using stock air coolers)

              -Core Clock 900 MHz

              -Memory Clock 2106 MHz

 

My Question:

 

Should I purchase waterblocks for the 560ti's and overclock them (as well as overclocking my CPU)

OR

Should I purchase an EVGA GTX 770 4Gb Classified or EVGA GTX 780 (if I have enough money)  and then perhaps OC my CPU

 

 

*Edit

[Dudenstein]

I would sell off the 560ti cards and upgrade to a 7 series. If anything you can get water blocks for whatever new cards you get and do a custom loop with that. There's no real point in buffing the 560ti at this point. I have them and I'm itching to upgrade them too but I'm still content with their performance (1080p).