All of it. Everything.
Last one (it's a perennial favourite, actually) is my Orange. I can put it away for months at a time, then decide it's time to sell it, plug in to make sure that it's all ok, then play nothing but that solidly for a month!
Same with guitars - Tele into Engater Renegade, and that's all I'll play for months. But then I'll get tired of the sound and back to my Yam SG, and the tele will set gathering dusk.
I guess I'm quite fickle.