The unit is way larger than we need but that size was "on sale" and cost little more than a locker half the size.
We started packing boxes in earnest today. It won't take us long to get the bulk of the stuff out of the basement. We're also going to be moving out about half the furniture from the living room so we can make room for Jeff's gaming rig and for the TV.
I'm hoping we'll only have the stuff in storage until a couple weeks after the basement is finished, probably late-February.