Use an old floating line for sink tips because the extra mass will cause line stretch in the tapered end of the fly line causing cracks and your line will be kaput in no time. You can cut 10' or 15' off the end of an old floating fly line and make a loop to attach 10'-15' tips as well. Casts much better. As SilverDoctor mentioned, a Full sink type 6 for the boat is nice to have aboard for when the fish are not hugging the bank and are glued to the bottom, which is more often than not.