Personally I would recommend restringing all of them at once rather than some at a time when they snap considering that a good set obly cost around 5 bucks also pick up a peg coilers makes things much smoother. Also as far as string brands I absolutely love ernie balls they last pretty long depending on how much you play of course. I play classic rock and blues so my string gauges are thin but they have w/e type you need. Play around with different types before getting hooked on one