Company of Heroes...
Rignt now, im digging sins of the solar empire right now but idk, i only know like 2 ppl who play it
Sin of a Solar Empire is cool, my machine starts to poop out when so many units are on screen though, and you can have a ton..
the best RTS on pc is imo (still) Homeworld, but its from 1998 wo hardly what you're looking for
Christ, can't believe that was 10 years ago! I still remember reading the review and thinking how beautiful it looked, if I could find the cd case with the code I'd be playing it right now!