I use Ernie Ball Classics. I've used several different string brands over the years, and the Classics are my favorite. They last longer, and don't get all grungy like d'addarios or Dean Markley's. I've yet to break an EB string even on my guitars with Floyd Rose bridges.
I used to like the Adamas Phosphor Bronze strings when I had an acoustic guitar, but I've tried the Elixir nanoweb strings, and they sound as good and last longer.
