So, I am gonna go out on a limb...
DO THE MDO!!!
I am a SAHM of 3 children. My hubby is in the military and there are stretches of time where it is just me and the kids.
When my husband is home, I get time away to have an "evening with the girls" go grocery shopping by myself, etc. It's not the same. I can get all the socializing I want, when I want it.
I want time away from my kids to clean my home. I can let things go only so long before it starts driving me crazy that the room I just cleaned is now a mess again because there are children constantly there.
I get things done. I live in a "lived in" style home where there is clutter here and there, and I clean too...but nothing beats being able to just get to it without all of the interruptions and having to re-clean the same place 20 min later, now and again.
In my humble opinion, I would go with the MDO, so you can have the time you want/need to go the library, sit and read, set-up/decorate the new baby's room or just clean the house.
Good Luck... ;-)