JalYt_Justin :
750Ti is way better for that price. Most games prefer the 750ti over the 270X anyway (in most common benchmarks). It will probably run quieter and a little cooler as well. Best of all, the 750ti is priced better.
That being said, it's worth saving up a bit and buying a 1050 instead. There's no point in buying old gen hardware. 1050 will run better than both of those two by quite a large margin.
1050ti is way better (plus, new GPU will have warranty, latest driver available, etc)
if u see in my PC specs, u can see that mine is almost identical as yours (though my RAM is 8)
and trust me, on high settings, AAA titles these days (and the future-upcoming) will use more than 2 GB VRAM, now i'm not saying that 1050 is a bad GPU, it's just going to limit your settings (while the 750ti will be a GPU bottleneck for your system on those games, R9 270x gonna suffer the same fate as 1050 imo, lack of VRAM)
i'm playing GTAV @ 768p and i already use 2.4-2.5GB on high settings (remember that this is on 768p, 1080p should use more imo)
if u go with those 2 GB VRAM, u'll have to compromise with the settings which would be a waste of performance there (since ur GPU can do better, yet u had to tune down because the lack of VRAM)
to answer the main question though:
i'd personally stick with the sapphire R9 270x since it offers more performance [they are on a different tier i think, the performance gap is pretty big there], which imo, worth the extra price
http://gpu.userbenchmark.com/Compare/Nvidia-GTX-750-Ti-vs-AMD-R9-270X/2187vs2188
though u might gonna hate the temps and power consumption
Edit:
http://gpu.userbenchmark.com/Compare/Nvidia-GTX-1050-vs-AMD-R9-270X/3650vs2188
forget bout the 1050
(almost identical performance for approximately 50$ less, same VRAM size, R9 is the better choice here [though the power consumption will be higher])
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