Tube Friendly Speakers

I use kef reference 3.2 with a 30watt lavardin. Know they work well with the 20 watt jadis monos. love the sound. Also try to hear

Living voice avatar and avatar obx (fantastic)
Audiophysic Virgo (great imaging but edgy)

Vandersteen Model 1 should work good with your amps. The larger Model 2's need more power. You will probably need to use a revealing speaker cable to get the best results.

You might want to try and audition the Soliloquy 5.3's and the Silverline Sonatina's. Both have kind impedence curves and should give your push/pull amps a break. I listened to them at different dealers, so I cannot really compare the two, but both were very good speakers. The Sonatina sounded very similar to the Sonata (to me anyway), though a larger room would probably widen the gap between them.

Meadowlark Kestral Hotrods. $ 1500 new, and you see them used in the 1k range. I'm driving them with a 45 watt, CJ MV52 and they are great in a 12x18 room with 12x12 alcove - yes, the dreaded L shape room. They go plently loud for me, and sound superb, YMMV. Prettier than the Vandy's, which I've owned too.

Look for a pair of used Alon Lotus speakers. Especially designed (14 ohm bass drivers) to mate with low power tube amps. Fabulous with acoustic music. Open, airy, spacious, huge soundstage, musically realistic tone and timbre. Dynamic enough for your large space now. Will work fine in smaller spaces.

I've heard ProAcs sounding wonderful with tube Cary amps. The Coincident line well worth checking out too, their bass drivers also designed to be tube friendly.