It all depends how fancy you want to get... my favorite for backtrolling plugs is an HSR-1021C Loomis in GL3, but for Kwiks with a jet diver I prefer a Lami 9' Salmon Moocher. The Loomis has caught everything including chinook, steelhead, walleyes, a 6' Sturgeon... you name it. If you're limited on how many rods you want to carry, the HSR is great because you can also drift fish with it.

That said, you can often do as well or better with a less expensive fiberglass rod for pulling plugs since it seems to give a good lure action and lets the the fish inhale the plug a little easier.