In one post you asked about a sink tip and then you mentioned a floating line for Smallmouth. Are you thinking about more than one line?
For a floating line the SA Bass line would give you a good head designed for tossing big flies. If you are fishing lakes it would be a good choice. If you are fishing rivers with currant you might consider the SA Nymph line it is a line that should be more popular. It is designed to cast flies with split shot and would be a good choice in a river with currant. It is an under utilized fly line with a long belly and would toss big flies well. Even the tip is a little bigger around to give more flotation. Its big strength is how well it mends with the long head. Go to the SA site
and take a look at these lines. Down at the bottom of the page where these lines are discussed is a link to a data sheet that shows the tapers. The Nymph line is not a distance line but I don't think that is what you want. It can be used with some Spey types of cast because of the long head. Both RIO and SA make similar lines and both are top quality. With a sink tip SA makes many and its is just a matter of picking one you like.
If you are fishing Smallmouth more than likely the Saltwater lines would not be a good choice as Cliff has pointed out.