What pc game should i play?

so i recently built a new rig after 4 years of not playing pc games... its pretty decent here are my specs 4gb ram ddr3 nvidia gtx460 1gb phenom II x6 1055t running at 3.8 etc i bought starcraft 2 and played for like 2 months but i dont really open it anymore :S.. i have counter-strike but it got really... show more so i recently built a new rig after 4 years of not playing pc games... its pretty decent here are my specs

4gb ram ddr3
nvidia gtx460 1gb
phenom II x6 1055t running at 3.8
etc

i bought starcraft 2 and played for like 2 months but i dont really open it anymore :S.. i have counter-strike but it got really boring not the same as before when i used to play..

im stuck :(.. i like rts games and fps games... i also like any games that have alot of users playing.

please give em some hints on what to play and please dont tell me world of warcraft, thanks.
Update: id prefer games which requires skill and not time to be good, if it makes any sense
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