Looking for new (to me) Speakers for Leben CS300XS---Devore, Harbeth, or Reference 3A?

Chris,
@lalitk offers a very wise and doable suggestion.
I’m skeptical about the Harbeth driven by the 15 watt Leben however you have the fortunate opportunity to take your amplifier and listen for yourself.

No matter how well intentioned or thoughtful some of the responses you’ll receive here,   the ability to actually hear, the Leben with your list of speakers is the superior option.
Charles

I wouldn't let anyone bring their amp into my home and try it on my speakers before purchase. In fact, my system isn't an audition period for anyone. Learned that lesson long ago. 

I run my Ref 3A de Capos with a 4 watt Decware mini torii. Does it get concert loud, no but loud enough for a 12x20 room.

I’m using a 20-watt Raven Audio Blackhawk with the Reference 3A de Capo i speakers and it has considerably more than power than I need for anything in the wide range of music I listen to in a medium size living room.

I owned the DeVore Super 8 speakers and absolutely loved them but was driving them with a considerably more powerful amp.

Yes, some good advice here. Use your Leben to audition if at all possible.

An 81mile round trip ain't too bad. I once did a near 400 mile round trip to pick up some Quads! Never again.

As @tvad said, why limit yourself to a choice between these three? The Tekton Perfect Set certainly looks intriguing.