hi Mike
I mostly use the 15 foot Leeda tapered leaders; inexpensive, reliable, and thick enough at the butt to help the transition from thick fly line down through the leader to the tippet. Seems to reduce the hinging effect which I've seen on a couple of folks' setups this year where they are using thin mono leaders tied straight to the fly line.
I chop off the last 3 feet or so at the thin end, and tie in a 1mm seamless steel ring. Onto that goes a few feet of tippet. Optionally a dropper can be tied to the ring too.
It's been my setup for years now, and works for me; simple, unfussy, reliable. The leader will last a long time (maybe only need to change the leader once or twice a season, and I'm out fishing a lot), and cuts down on the amount of tippet I need to change/discard.
cheers
iain