I vote for 747-100/200/300. It seems it's been ignored for modern simulators. FS9 had a pretty good one from Ready For Pushbback. I'd love to see what CS could do with it. Easily one if not the most recognizable aircraft. I wouldn't mind seeing them do a classic airbus too. Boeings seem to be their thing though.

DC-10 would be cool too. I love the DC-10.

I just hope they add a version with a cabin. That's one of my favorite things to do in FS. Sit in a cabin.

One thing I wish they'd do is make it where you can see the cabin in the VC version of the 777. They said they would in a post a couple years ago. Just cut the cabin a little.