Lets see now...
I have 3 guitars in drop B. This is my main tuning. C-Pig, Pig and Monster Miracle Man are in the bridges of these guitars (and cold sweat, 2xIT, 2xUT). They. Fucking. Slay.
The other guitarist in my band likes Drop C, so we play in both and I have 2 guitars in it now (with painkillers and crawlers).
Then theres standard E, drop A, drop A on a seven string, my acoustics in standard D for some reason, and my bass in in drop B.