You're actually selling a Rolleiflex in order to purchase a digital Mach XXI MKHRLXHQ somethingorother? GASP! If I didn't already have 4, I'd gladly make an offer, but there's no more room for any more photo equipment.
Blasphemy I know (especially around these parts). I just can't justify the effort of developing film in my basement bathroom and then spending hours scanning it (which is probably the worst part) for family snaps.
I really think you need a 5th though. You know what they say, make sure your backup's backup's backup always has a backup!