Generally speaking, the line/rod weight recommendations listed by reel manufacturers is pretty accurate. A reel listed for 5 and 6wt lines will work fine with those rods. Particularly for 9' rods. Short rods usually match up well with a smaller reel and are really the only situation where I would even start to think about balance. Even then I don't fuss with it much as the corresponding reel size still works fine even if it looks a little large on a particular rod. Frankly I think that rod/reel balance is one of, if not the most overstated aspect of rod/reel selection. Just don't do anything crazy like throw an 8/9wt reel on a 5wt rod and you'll be fine.