Best PC games?

[Mansispicher37]

Specs: Windows 7 64-bit
4GB RAM
ATI Mobility Radeon 5650
Intel core i5 M460 2.53 GHz
Any recommendation would be appreciated

PS- I'm a huge Sci-fi fan

 

[daniel_blacke]

FONV has pretty good replay-ability. I have my new gtx 970 coming from newegg and fully intend to play it again on Max settings, just cause I can.