Hi,
I think there fantastic names, not to long and not to short, think about it, that saying "favoritesubject" is used everyday by people all over the world, how many times have you been asked what your favorite subject was at school/college/work and how many times have you asked a kid that? or your partner when you was dating etc etc, these have excellent potential and could turn into a fantastic forum covering ALL topics and how easy is it to remember, i know if i heard this over the radio i'd remember it. As for a price, i don't think there can be a value for this name on it's own, but if i was to bid for it, i'd say $100 for the .com alone.
Good luck
Thank you
Sin