Old Ways Are Best!
Mature gamer (teeth cut on the AH classics), so while I still think of myself as a war-gamer it isn't very often I will play an actual "war-game." What I am playing mostly these days are multi-player strategy games.
Empire building/"4X" games and Rail Games are the sort I lean toward however some economic games appeal to me as well. Our group prefers games that take about four or five hours at the very most, so some of the heavier titles don't get a lot of play. Civilization, Age of Renaissance and Twilight Imperium are reserved for the infrequent "all-day" affairs we can occasionally fit into a long weekend. What a wonderful find Eclipse has been for us as the near perfect "Civ" style game that plays comfortably in the time we usually have, often with time for a filler as well (hello 7 Wonders!). Game of Thrones is also one of our favorites.
Britannia is on the outer edge of fitting the bill as much as I enjoy it. Revolution: The Dutch Revolt, 1830 and Die Macher are on the bubble as well, which is a pity since those games are great!
I've found that a lot of Martin Wallace's designs hit my "sweet spot" these days. I will play most of them without hesitation: Brass, Rise of Empires, Struggle of Empires, Steam, Princes of the Renaissance are all good choices. I also greatly enjoy many of the GMT card-driven strategy games (CDG), but some of them also push the time envelope.
I don't get the opportunity to play many two-player games anymore, but when I do Hannibal: Rome vs. Carthage, Twilight Struggle and War of the Ring are among my favorites. I have to figure a way of squeezing more hours into a day!