I play a lot of acoustic lately and the John Pearse Phosphor Bronze strings are my go to acoustic strings on all my guitars, in either lights or mediums depending on the specific guitar. If I want to mellow it out a bit from there, I'll grab some Thomastik-Infeld Spectrums - they're expensive, but they sound great. If I want to brighten the guitar and thin out the low end, Elixer 80/20 Bronze strings work well for this.
I'm also with guitarfishbay on this: try 80/20's and PB's of the same brand to see which you like better on your guitar. Then experiment with the different brands to find your favorites. Also, I like to keep fresh strings on the guitar as the coated strings will start to peel and flake after a bit if you use a pick on them. They seem to last better for finger style players.