I've not used it, but you might try
GMax. It is basically a scaled-back Version of 3D Studio Max that is offered for free, for game modding. It can model, but lacks the rendering capabilities of 3D Studio Max. Just something to look into.
EDIT: Maybe not, I looked a little closer and it appears that it will only export to specific game formats. Whether or not one of those formats is .x or a format that can be convert to .x easily I do not know.
EDIT2: I know for a fact that it will export into M3D.
EDIT3: Look what I found,
GMax to X-File. I appears that gmax can be made to export to x-file. Happy Modeling.
