I don't know if I wanna go with 7.1... I kind of feel there are diminishing returns from doing so, but I may be wrong... But what would your reasoning be? (The right surround would be hard to lower, due to the door)
What would be the diminishing return? IMO, 7.1 sounds better than 5.1, especially if you have the room behind your seating (2-3 feet), which it appears you do. Depending on your receiver, you can use PLIIx (or other) mode to matrix any 5.1 soundtrack into 7.1, so it doesn't really matter that there aren't many 7.1 soundtracks.
I didn't realize that the one side speaker was right above a door. Mine is the same way. Put it as low as you can and angle it down slightly (not necessarily at the seating, but perhaps to a spot right above the listening position of the furthest seat from it).