This will be a really easy decision to make if you have a multimeter. Do you have one? If so, switch it to measure AC voltage, and place the leads across the terminals of one of the speakers. Crank them up to the
loudest that you know you will ever listen to them at playing your one of your favorite, gnarliest songs. Then, take note of of what voltage the meter is reporting.
What I'm getting at is that with those two pieces of data, (the song, and the peak voltage going into your speakers), we can develop a fairly close approximation of your maximum listening level and bass requirements. From there, you can make the appropriate cab choice for your maximum needs.
Bill hit it right on the nail head. At war volume, these speakers can really dish-it-out (pro sound and cinema for example) and require
plenty of sub to keep up (especially when you relieve the bottom end by crossing over). I believe however, that even at "spirited" domestic listening levels, a smaller cab may suit your needs just fine.
With the cab stuffed in a corner, facing the mouth of the horn up is acoustically no different than facing it forward. Just remember, ideally it should be firing "into" the corner where you wouldn't see the mouth of the horn at all.
