Well, taking other games into account as well, Battle for Middle-Earth would probably be the best one around at the moment (from what I hear from friends (who are not always right
)). But I'm not that much into fanatasy settings when it comes to RTS (like Warcraft, don't like it). Emperor look interesting, but it's so old I won't find it in a store (don't wanna order cause I need a game to kill some time tomorrow).