CLGEU and M5 are both great teams, but my cheering will always go out to CLGEU. I love 'em, each player is awesome.
Speaking of strong teams right now, TSM has been doing really well lately. Even without their Karthus/Nocturne/Kayle combo they can run generic comps and still come out on top.
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~Peaf~
"Later that day, I f***ed a panda." - PSO