Monitor speakers for Tube integrated?

You may be able to use a wide variety of speakers. The variables are how loud, how big the room, how close are you to the speakers, what kind of music will you listen to, will you likely upgrade in the near future. As an example, I am playing CDs through a Sonic Impact T-amp, 6 W/ch, through Dynaudio Audience 70 floorstanders in my bedroom. They are 87 dB into 4 Ohms. I can achieve loudness of 80 dB with little distortion in a room that is 17' x 13' with vaulted ceilings playing Classical, Jazz and Folk. So, it depends. But I would say go for the highest quality speaker you can afford and settle for less volume with higher fidelity. You can never go wrong with fine speakers. They last the longest of any component you will buy. Good luck in your quest.