help me decide on which game to buy

I%26#39;m looking for a new rts gameI have a good pc, the next thing i%26#39;m looking for is online play.The two games that i really liked online were age of empires 2 (my number 1 game specially online) and warcraft 3 the frozen throne.I liked red alert 2 for gameplay in general.what game do you guys recommend?I%26#39;m currently undecided between c%26c 3 (ea games right now are not that good even though it might be fun for a month or two) or supreme commander or company of heroes or maybe something elsehelp me decide Thanks Moh