I've had the same problem finding tube-friendly speakers for my 15W integrated. I settled on the Energy C-3's since I'm on a tight budget and they have a respectable 90dB in-room efficiency. I understand efficiency isn't everything, but it's a good starting point when shopping for speakers.
The Von Schweikert VR-1's are highly recommended for small tube systems. However, having 30W to play around with, I'm sure there's a lot more options out there.
The Von Schweikert VR-1's are highly recommended for small tube systems. However, having 30W to play around with, I'm sure there's a lot more options out there.