Do I have enough power?

Actually, I already have the Cronus Magnum and I am contemplating getting a pair of the Mani-2's. It's good to hear how much you guys like the Mani-2's in general though, because I'm still not completely sold on them (I'm considering the Totem Hawks as well, and other speakers). I have the Rainmakers now, and the Hawks sounded very nice to me. I'm mainly looking at floorstanders, but I assumed that the Mani-2 might have a very full sound despite being a bookshelf speaker.

I also have an NAD C375BEE integrated amp, rated at 2 X 150W into both 4 and 8 ohms. I thought my Rogue Audio amp was much better, but would the NAD's higher power rating make it a better match for the Mani-2's?

I doubt you will like the NAD (though I've never heard it) better than the Rogue with Mani's. I don't think 150W of SS power is enough to make that much difference.

I think you will just need to try yourself. I found that I preferred my Butler 2250 (hybrid 250W amp) into my power hungry SP Tech Minis, but the Rogue Stereo 90 into my Von Schweikert VR-4s. Once you get past basic amp-speaker matching considerations, synergy becomes a bit more mysterious. The SP Minis in my small space were in no way straining the Rogue, but the Butler did sound better. It may have been the extra power or something else.

Rossbernstein-
Yeah, I figured out my misread shortly after my post. What is it exactly about the Mani's that you find yourself not sold on? Just curious. At times I have issues with them, other times they're just perfect. That's very likely no different than any other speaker I might have purchased. They were by far the most challenging speaker I've owned to figure out how to drive, but that's probably because I wasn't hitting them with an amp of sufficent power. I did find however that it's easy to find retailers who will tell you that the amp they are selling will match wonderfully with the Mani's. They were, well...selling.
Jerry

I think Bggregory is on the right path.

Mani's I have heard of McIntosh amplification lead s me to believe the might trend towards being a touch bright with some amps (similar to my Dynaudio monitors) and digital sources. Not a good or bad thing inherently. Tube amp might sound good but would need to be beefy to always sound good in any room with any kind of music. I'd go with a beefy high current capable SS amp and tweak things from there using setup, ICs, pre-amp, DAC as needed until dialed in.