Hey SF,
If you like 'em all, don't pressure yourself to sell any, even if you pull the trigger on a new one. It's all about the journey. While 7 may be ideal, just extend the rotation. Baseball uses a 5 man starting rotation now and no one finishes games. I remember when there was a 4 man rotation and they bopped 'till they dropped. Or they brought in Dick 'the Monster' Radatz in the 6th or 7th inning to finish the game. So try some relief appearances; you might surprise yourself. I speak from experience; on some days a given guitar just isn't doing it. And a 12 string makes for a great reliever. And there are some days I just don't get a chance to play. Boo, hiss.
I will also admit to playing favourites. My 412 gets the lion's share of playtime, followed by my 355 and 818. No real planned rotation. I just mentioned the rotation thing because you mentioned the "one for each day of the week" thing; just having some fun with it. Which one's your bestie?
Enjoy,
Don