Tube-friendly speakers

I'm currently using a pair of Magnepan MMG's and a Hsu Sub along with my AES Six Pac amps. I'd like to move up to a larger set of Maggies, but it's been suggested that 60W of tube power would not be enough.

What are some speakers that would mate well with these amps? I do like the "planar sound". I'm most interested in something full-range, but could run a pair of monitors with my sub.