I have been trying to think of something, and I can't. There are a Couple that I would enjoy seeing and playing again, but then after that, I'm good with not having them permanently. I don't permanently bond with a whole lot of Stuff in my life. I enjoy it, and I usually then sell it and find some new fun.
My only regret sells are in the guitar and drums categories. In drums, I sold a cymbal set that was a giant mistake. I essentially gave them away to a young drummer, which was good, but, I never recovered from that. Those cymbals were better than anything I play today. In guitar, I had a Kramer Ferrington that I really loved, and that I did special stuff with. [church] I wish I didn't sell that guitar, and they don't make them anymore.