Good acoustic strings? If you have money, get some Elixers or Dean Markley's Blue Steels, Phospher bronze, I like the 10 set, I think those are mediums.
If you don't have money, D'ddario's mediums are my favorite when I don't feel like dumping money into the acoustic(s).
I put Ernie ball slinky's on my electric 6 string, and my basses get mixes of GHS, Fender, and D'ddario's.
I replace my strings once every 6 months, or whenever one breaks, unless they are a pretty new set, then I just get a single string, or whenever they sound dead.
I like my bass strings to be a little broken in, I'm not looking for twang or crispness, I'm looking for punch. I want my electric guitar to be crisp so with a lot of playing they tend to get replaced every month almost, but I can replace those strings almost 5 times for the price of my bass strings.
I also tend to buy new strings before a big gig, or after a well paying one.