I started out with an 8 and now fish a 5, mostly. That works well for me on trout and panfish. Even used the 5 for chums, which may explain why the rod recently broke.

I like the lighter rods. Used what the gude said was a 0 on the Yakima; he also called it a toothpick, which describes how it looked. That was a real kick, landed a couple nice ones on it, too.

I'd say, especially if you are looking for trout and panfish, that light (low number) is the way to go. But, go out and test cast a bunch. See how far the rod comfortably casts; will that cover the water you want to fish?