It's somewhere here on the Omega AudioCircle. If memory serves me correctly there's a sort of Decware club in the Chicago area and it was mentioned that in order to equal the tonal quality of the SE84, one had to go to the Mystery Amp. I've heard that the Line Magnetic amps are way less money in China than in the U.S., so what is it's "real" value? $2500? If you're running ANY current Omega the little Zen is a killer match tried and true. If you need more power to drive less efficient speakers, I would buy a more powerful Decware.
All things considered, what is your priority? For me, it's not about power - it's about tone and speed. If an amp has these two down right, all the audiophile superlatives will come into play, that is, when matched with the right speakers. Due to the SE84s ultra simple circuitry, and very fast and linear 9 pin output tubes it fills these bills beautifully. Never heard a faster amp.
Over the years, my recommendation of the SE84 has always been in the context of matching it with Omega speakers.