Kegonsan...generally with mid-power tube amps like your Shindos, you want speakers that are fairly sensitive (90dB+) but more importantly speakers that do not present the partnering tube amp with a difficult load. Look for speakers that are nominally rated as an 8ohm impedance speaker with no dips below 6 ohms. Also the flatter the impedance curve the better as tube amps generally do not like big shifts in impedance across the frequency spectrum. Some speaker brands to think about - DeVore Fidelity, Coincident Technology, Audio Note, Audio Kinesis, and Merlin (plus many others but these come to mind).
Personally, I would seek out the Devore Silverback Reference speakers and audition them with your amp. I think you will like this combo very much. I admit I have not heard speakers from the other lines so I cannot comment on their sound other than to say they are typically tube-friendly and on paper should mate well with your amps.
Good luck.
Personally, I would seek out the Devore Silverback Reference speakers and audition them with your amp. I think you will like this combo very much. I admit I have not heard speakers from the other lines so I cannot comment on their sound other than to say they are typically tube-friendly and on paper should mate well with your amps.
Good luck.