SoftTH = DirectX9 only and lots of hassles = FREE, I used it for two years before finally buying 2 x GTX470s and would not go back. You really would miss the DX11 in some titles.
Also, soooo much easier to get games running with nVidia Surround 2D as compared to SoftTH.
I recently updated my drivers to nVidia 280.19 Beta and can once again run every game out there at max detail, texture and resolution (except perhaps GTA IV which allows crazy texture loads).
So would definitely recommend 2 x Nvidia whatever you can afford, would not go with X60's, go for 470/570 or 570/580.
I have never been happy with ATI from personal experience, don't like their video card or tv cards.
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Core i7-8086K @ 5.0 Ghz | H60 | Nvidia GTX 980 Ti 6GB | Soundblaster Z | Asus Z370-A
16GB DDR4 | Win10 x64 | 3x27" Asus IPS @ 5760x1080 | Samsung 970 1TB NVMe
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