To make things worse in our case, with the Milan plan, the basement situation is aggravated by the awkward design. They just put things in weird positions such that it hinders the expansion of the basement. A perfect example of this is that they put your bathroom (or bathroom rough-ins) right in the middle of the floor plan! Basically, if you ever want to finish the unfinished (or "storage") space, you'll find that you either can't, or you'll have to move the bathroom (costly), or you'll just have to deal with the bathroom being right in the middle of your open space (which would look really weird IMHO).
To demonstrate what I am saying, take a look at these unmodified basement plans for the Milan:
On a more personal note, I am a bit let down by Ryan Homes in the basement (and bang for your buck) world. On every basement design that I've seen for them, they only give you a small area as "finished" then charge you extra for any extra finishing you get (e.g. media or exercise room). That's very convenient for them. Personally, I think they should finishing those spaces with the pretty high price they are charging to get the finished basement. Beyond that, I don't like the fact that they don't seem to give you any leeway to customize anything in the basement (wall configuration, etc.) and, from what I've seen so far, they're pretty resistant to any changes that you do propose.
At any rate, I plan to do whatever it takes to get that bathroom moved....... don't care if I have to go run around the job site naked every day until they give in! :)