What speakers do you use with your SET's?

I use the Carolina Audio JSM speaker that uses a single driver (Jordan JX92's) in a transmission line design with a pair of Wright WPA1.75 mono blocs (type 45's giving 2w/ch). Since the JSM is a monitor, I use a REL sub with it. One could use the JTM without a sub. Works well for moderate level listening in a small listening room.

Galante Rhapsody used here; love them and the cabinets are solid wood..canadian maple and spruce

I pair the 10watt Siegfried with Merlin's VSM-M. Anybody with similar set-up?

Depending on your budget, these all work nicely.
Avantgarde Duos
Cain & Cain - Bens
Klipsch KLF-20's & 30's
Good luck!

Gallo Reference 3s. My 12 wpc SET monoblocks (845 outputs, EL-34 drivers) sound fantastic with these speakers -- in a large room. Other SET friendly speakers you wouldn't normally think of are the ProAc Response 2s and Response 3s. My old Response 2s are currently powered by 6 wpc SETs.