GTX 760, 770 or R9 280x

[McSteamy]

I'm looking to pick the card in my first build. I can't decide between a 760 2gb , 770 2gb or a 3gb 280x....I heard the 760 doesn't have much a difference between itself and the 770. The 280x is so damn close to a 770 and is cheaper. I live in Aus so the prices are terrible...Can you sugesst which one and why? How much Vram is needed? I've got a EVGA 760 with ACX cooling that I'm looking at now. Here's the whole build.
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4570 3.2GHz Quad-Core Processor ($222.00 @ CPL Online)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($39.00 @ Mwave Australia)
Motherboard: ASRock H87M Pro4 Micro ATX LGA1150 Motherboard ($105.00 @ CPL Online)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($102.00 @ CPL Online)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($109.00 @ CPL Online)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($69.00 @ CPL Online)
Video Card: EVGA GeForce GTX 760 2GB Video Card ($329.00 @ CPL Online)
Case: BitFenix Raider Window (Grey) ATX Mid Tower Case ($95.00 @ CPL Online)
Power Supply: Antec High Current Gamer 520W 80+ Bronze Certified ATX Power Supply ($85.00 @ CPL Online)
Optical Drive: LG GH24NS95 DVD/CD Writer ($23.00 @ CPL Online)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($109.00 @ CPL Online)
Total: $1287.00
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-17 18:12 EST+1100)

 

[sosofm]

280X is better than 760,770.If you will use more than 1 monitor buy 280x because have 3gb Vram. In my opinion the games will use more Vram.
You can buy 760 an after a year-two to upgrade to another video card.

 

[McSteamy]

I will be using one monitor. Do you have any benchmarks with a mix of amd and nvidia games?

 

[sosofm]

http://www.guru3d.com/articles_pages/msi_radeon_r9_280x_twinfrozr_gaming_oc_review,12.html

 

[McSteamy]

Mhmm, now I'm thinking R9 280X or 770

 

[sosofm]

You can't go wrong with any of them.