I have a 9' Cortland Combo 4-5 weight. For panfish only, I'd go with something like a 2-3 weight - maybe an 8' or so. Don't ask me which one as I've been looking too and haven't found it. Most combos seem to be 4-5s with good reason. On flies, I've had good luck with hares ears and some of the similar ones. In fall, I've had good luck with grasshopper and cricket imitations. In the evening, some of the dry flies work well for bluegill and crappie. I'm a novice though. Here is a good site.
http://flyanglersonline.com/