Warhammer: Mark of Chaos -- Battle March (PC Games, 2008)

Yeah, the load times between battles are a bit longer than you'll be used to. And this game does need a decent rig to play on. But this game is a thing of beauty. Gone is the 'disposable hero' RTS, where armies are wiped clean at the end of every stage, and body counts don't matter; in this one, your army IS A CONSTANT. Every single soldier that dies in battle leaves that squad weaker the next time it fights. Yeah, between battles, you can heal the squad and bring it back up to strength, but this costs money, and there's not always enough money to go around (especially in the later stages/higher difficulties).

The campaigns are a blast! Play as the only real Human army in fifty miles, fighting back war bands of Chaos Marauders and their Demon-kin! Take up the banner of the Orkish Waaaagh, and stomp dem 'Umies flat! Or try on the spike-covered armor of one of the Chosen of the Chaos Gods, and show the Empire why they fear the men of the cold Northern wastes!

This one's got it all; multiplayer is set on a point-buy system, which allows you to customize your army's make-up. Not just the troops, either; take the paint brush, and color your army, right down to the standards! Raise those banners high, boys, there's a war to fight!