Mine is probably [ɬ]. From the moment I learned about it, I thought it was a super satisfying sound, though I haven't used it in the conlang I'm currently tinkering with (Hip'alŭk'). However, I've recently gained a strong liking for [ç], which is in Hip'alŭk' as an allophone of /h/ (in fact, it's in the name: [çiˈɸalʊkʰ]).