Dunjinni and Campaign Cartographer 3 (with the Dungeon Designer 3 add on) can do a pretty nice job of quasi 3d, more of a top down but still pretty nice. If it were me I'd go with Dunjinni as there are tons of awesome user creations on their forums and the masters over there can make some near photo realistic stuff. That's my 2 cents and I'm sure others will be along to add in theirs as well.