Should I buy another GTX 760(sli) or a single GTX 970?

[Xealyth]

On eBay the GTX 760 are going for really cheap as low as <$100 if I can get lucky, and just a little above it for most of the cards. A GTX 970 is around 300 bucks and I just don't have that kind of money to spend right now. Actually, the problem isn't really so much as deciding right now, as I really don't want to wait and I doubt a GTX 970 price drop will happen anytime soon, but I have a couple of concerns.

I don't know if my PSU is up for another GTX 760. I have a 650w Seasonic: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151118

Some people say they got away with it, but I'm not so sure: http://www.reddit.com/r/buildapc/comments/1k3tpz/build_help_is_650w_enough_for_an_sli_set_up_of/
From that thread, going with the mindset that two GTX 760's perform with 200 watts under full load, and my i7 4770k goes just under 100 watts, I should be fine?

Also, the GTX 760 I have is a 2gb model. Will that alone make me regret buying another one? I play at 1080p but apparently GTA5 uses a lot vram, and I'm not so sure about future games.
Thanks for your time.

 

[WildCard999]

Your better off selling your GTX 760 2gb and going for the GTX 970. It has more VRAM (no stacking in SLI) and won't have any of the issues that can happen when you utilize SLI such as overheating/graphic distortions/driver capabilities.

 

[Ironsounds]

Hello... The GTX 760's are 150 watt GPU's... One card is less headaches/power/heat APP friendly... but yes the Price makes it attractive option right now... having 3-4gb VRAM is a standard size for the future you won't have with SLI GPU's

 

[Diganta Das]

As WildCard99 said. you should better buy a 970 by selling your GTX 760. That will make your rig more power friendly plus you will not have the headache of heating that you'll get with an SLI.