Most tactical/strategic combat

sunandshadow

Having failed to find an MMO with good pet-breeding and player-constructible housing, I thought I'd try looking for something different that I like in an MMO.  I'm looking for a solo-friendly game with complex tactical or strategic combat.  Something where you have to decide in the middle of each battle against monsters which tactics would be most effective against that particular type of monster or mix of monsters.  So far the best tactical combat MMO I've played so far has been Dofus; that game has a range of classes, with most of them being very easy to play, but the summoner classes and the trap-user class having more complexity.

If you recommend a game, please let me know what kind of pay model it has, what kind of crafting it has, and whether it has a rich story or crappy story or no story.