Agreed that Sanctuary is nicer. It seems to me that Serenity is a cheaper version of Sanctuary/Tiburon.
I think there have been a few decent deals in the last couple of months.
There is the infamous Shadtree Calabria home at $166 a sqft.: http://www.sdlookup.com/MLS-100054326-13348_Shadetree_Ct_San_Diego_CA_92131