About your speakers and desired tube amps, below are two snippets from other published sources, that being Stereophile Magazine on the first, and ARC's own website on the 80S amp.
Turning to the Perspective2's measured performance, my estimate of the new speaker's voltage sensitivity was 83.6dB(B)/2.83V/m, which is within experimental error of the original Perspective's 84dB. This is low, but the Perspective2's plot of impedance magnitude and electrical phase against frequency (fig.1) suggest that the speaker is an easy load for the partnering amplifier to drive
The 80S was created for the music lover who does not require the output power of its larger siblings, the Reference 160S stereo and 160M mono amplifiers. The 80S continues the design ethos, including dual GhostMeters® that float in front of four KT150 output tubes. Extruded panels, a vital part of the all-aluminum chassis, provide rigidity and beauty.
To state the obvious, 84 dB efficiency is on the low end of being a friendly speaker. In fact, your speaker, does not seem "amp friendly ". As for your desired amp, it uses Tung Sol KT 150 tubes, which is a big honkin power tube, so that's good. If you're going to pick an amp with descent power, 80 or so watts per channel seems okay. Will 80 watts be enough to drive an 84 dB speaker? I think that depends on how you like to listen to music; 80 watts via KT 150s has some oomph behind it, but if you want concert levels of volume, I don't think you'll arrive at your destination. I think that combo will play okay, and "loud enough" if you listen at a sane level.
About where I'm coming from on this is a bit of my own slightly similar experience in that I have a similarly powered amp in a pair of Lamm ML1.1 monoblocks, and they're claimed to cook-up 90 watts per channel. I absolutely love these amps, music through these are magical but they do have their limits. I have two speaker pairs I use, a pair of Focal Mezzo's at 90-ish dB efficiency and a pair of Von Schweikert floorstanders at 92 dB sensitivity. On these speakers, that amp works terrific; it plays pleasantly loud, not concert going level loud though, which some like. Your speakers are less efficient than what I have. At 83 to 84 dB sensitive speakers, I'm not so sure 80 watts is going to be enough, depending on how the loudness level you like. It'll play yes, it'll probably play to an enjoyable high-ish level, but if you want to crank it when Billy Idol sings Rebel Yell at concert levels, even 80 watts from KT 150s will have their limit. If you want loud, perhaps think about VTL's higher output amps or bigger amps from Audio Research. Lastly, about tube amps, EL 34 tubes amps, do not play like KT 150 bottles. You'll not get great warmth with KT 150 bottles. You'll get ARC sound closer to neutrality in sound signature. My Lamm's liquid midrange is something to behold, but it can't play to the dynamics my highly hopped-up Sonic Frontiers Power 3s using 8 @ KT 120 bottles per mono can cook-up. Chris @ Parts Connexion says my modded amps are rated at 260-ish wpc. These amps can play with oomph, and if you're looking to have that feeling of concert venue loudness, 260 wpc will get done, but with 80 wpc, I venture to say you will get polite loudness, which if that's your cup of tea, cool, but if not, look somewhere else.
It seems to me you're looking to spend about $10,000 or so dollars. That's a chunk of cash, at least it is to me. You can get a lot of nice amps for that kind of dosh. There's lots to consider; I've tried to touch on some major points. In any case, I'm sure whatever you get will be the right amp, because it is you who made the choice! Happy amp hunting!
