Are Quicksilver power tube amps in the same league as VAC, VTL, BAT, ARC, ...?

The Tubes4Hifi Vacuum Tube Audio (VTA) tube amps are excellent bang for the buck. Their service and support is wonderful, and they have a significant following.

Their factory wired M-125 monoblocks (125wpc) are $2700 plus shipping, less if you buy in kit form.  
http://tubes4hifi.com/

I need to drive 87dB speaker, so the power has to be at least 80Watts.

Unless you are nearfield or have a smaller room, you'll need more power than that! But to your OP question: 'Yes'.

My QS Mini-monos are my favorite amps and I've owned quite a few different amps. Not much to look at but they sound sweet. . 

I own the M120s, and they are just phenomenal... I would put them up against any and all oncomers. 

Absolutely!!!   I have had my Mid Monos since '15 and they are the best sounding amps I've ever owned.    They are a huge bargain compared to a lot of other amps.   If you owned Mike's new 120 monos you would not be disappointed.   

I am having a new amp built...  why?   I don't know, late mid life crisis I guess....  one thing is certain,  I will never sell those amps.   In fact I just picked up a preamp and tuner to pair with them in a second system .

I have sat here many nights listening, saying to myself, why am I getting a new amp?   They are that good for the money.