We have two older 10K corn bins that you can have the Sukup stirrators as far as I am concerned.  They don't level well and something is always broke.  On our newer 25k bin the power sweep and stirrators seem to be much better in quality and there haven't been any problems.  The power sweep is a nice option for cleaning out the bin we really like it.  I realize you won't have any stirrators but we gave them a second chance to see if quality improved and it did.