Liam you'd be as well using the full range bar the floating poly-leader which I have yet to find a use for outside of teaching.
I'd pick up a full set (maybe without the intermediate, although that does have its uses) and adjust the poly-leader to the speed and depth of the water and where you
want the fly to fish, there is no optimal choice of poly-leader or quick solution IMHO.
Don't be tempted by trying to shift overly long poly-leaders, that can be a challenge on a single-hander which I'm guessing is the rod you've got in mind
Which fly line(s) do you plan on using
H