Anyway, Starcraft 2 is still pretty active on the casual side, and with the new expansion coming out later this year (already in public, but not open, beta) it will surely drive a flock of new players. On the note of Supreme Commander, one of the top players of that game has been a Starcraft 2 pro since beta (TheLittleOne, aka TLO).
I still miss something like Commandos: Behind Enemy Lines, that was a surprisingly great game.
However, I did get in my share of turn-based games. I remember when I first played Civilization, it was over Christmas break during college, and I didn't go home because it was too expensive. I ended up playing Civ for 3 days straight, and my Christmas dinner was toast, 6 boiled eggs and peanuts... whatever I could rustle up quickly without taking too much time away from the game.
I love Starcraft 2 as well, and play it occasionally. In Starcraft however you're forever stuck in skirmish mode; there's no possibility of conquering a whole country in a very long campaign like in Total War or Lords of the Realm, and developing your nation into an economic powerhouse on the way there.