Dear ArnoBaes,
Maybe you should wait for Gta 5. Rock star games is making this game on the PC version for about 2 years and as per the screenshots which they upload might be Handy for all the PC users.
Anyway, It's up to you if you are a hardcore FPS gamer. (Note that Gta 5 also has a FPS view)
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Far cry 4 has some connectivity problems which I've experienced a lot during CO-OP.
Battlefield has good ratings for both multi player and single player.
Battlefield 3/4/Hardline have an awesome Multiplayer experience. You'll Love it.
So I recommend you to buy either Gta 5 Or Battlefield.
Also please send me your System Components..
Happy Gaming