Good RTS games for the PC?

Company of Heroes was excellent. It allows you to build a base and defenses (pill boxes and tank traps/barb wire), but you cannot play the turtle in this game, you MUST go out into the map and aggressively get and hold 'capture points' in order to build up things like fuel, XP, etc, in order to buy base buildings and defenses, and also to upgrade infantry and vehicles. You cannot just hunker down and mine raw material, build a wall around your mines and your base buildings, and pour your money into defenses. This game's style is pretty much 'go out and run over the enemy, quickly'. I love, LOVE Supreme Commander, though. You can create a huge base, generate tons of power to supply energy to a bunch of metal generators, and shield the entire base in overlapping, powerful electromagnetic shields, and pretty much ride out any attack short of multiple nukes.... all while building up a massive strike force. That fits my game play style better. I love creating defense positions and securing them with redundant overlapping barriers and seeing if it can withstand enemy attacks.

Starcraft, Age of Empires, Civilization, Command and Conquer, Warcraft, and something I can't think of ATM.