World in Conflict is prob one of the best RTS games of all time. However, theres no base building etc. Company of Heroes is also good.
Theres usually only about 1 really really good RTS game that comes out every year. Have a look at dawn of discovery (aka Anno 1404) as well.
One of my personal favorites is Lord of the rings:Battle for middle earth 2. I'll never get bored of that game
And then starcraft 2 is on its way!