I am looking at upgrades to some machines using 2x ASUS 7870 DCUII 2GB & around the ?300 mark (what both cards cost when bought).

My options are:

Sapphire R9 290 Tri-X OC = ?277
Radeon 7990 light use = ?320
Ref R9 290X = ?300 (will get a Corsair ~?35 HG10 & use my existing H55 as cooler replacement)
VTX3D R9 280X 3GB OC x2 = ?330

Primary considerations are gaming @ 1600p/5760x1200 with Watch Dogs/BF4 & future titles under consideration, 3GB being minimum VRAM per GPU. I hate being spoiled for choice and am hoping someone here will be able to nudge me one way or another. While I prefer Green I have 8 of these machines & 4 run AMD, 4 Nvidia & it's AMD's turn for upgrade.

Rest of Spec:

4770K @ 4.5GHz
Corsair H110
ASRock Z87 Extreme4
16GB Patriot Viper 3 Red 2400MHz CL10
Samsung 250GB 840 EVO + 3TB Seagate 7,200rpm HDD
Enermax Revolution87+ 850W 80+ Gold
Win 8.1