Meebo: I want to use some *altcoin that is future proof, energy efficient, secure, fast, can be mined equally by every people, no fixed limit so casual people could use it in very far future too.
Currently Quark is one of my canditates too but lets see.
I really hope YAC development goes well and will be synced with newer features from BTC and building more stable releases. YAC solution is quite good to be future proof.