Certainly, if your goal is to upgrade your system over several years, replacing the existing gear with higher performance gear, then a better amp makes sense. However, if you intend to keep your speakers, CD player and turntable, then it pretty much will be like putting Goodyear racing tires on an Accord, and you should look at another Rotel, NAD, Cambridge Audio, etc. amp.
But, assuming that the former is true. At the $3000.00 and below price point, an integrated amps makes a lot of sense. No matching of components is involved, one less pair of interconnects to buy. You are not saddled with a great amp and a preamp that underperforms. Not that a Mac wouldn't sound nice with a Metis preamp, but this is a completely different price point than a Primaluna, so I think that you will have to make up your mind about your budget first. Even if you had the cash for the Mac/Metis combo, I should think that you are better off still buying the integrated and using the rest of the cash to upgrade your sources, speakers etc. You will not want to listen to an unbalanced system for very long.
So let's assume, for a moment, that you want a tube integrated. There are some great choices that are made in America, like the Rogue integrateds, Manley, VTL, CJ, Audio Research. Pretty much all of them will be available in the $1500.00 and under price range, used, on this site. But to answer the other part of the question, the Primaluna may, or may not be enough power. And that depends on how big your room is, what your musical taste is, and how loud you listen. The nice thing about this site is that you can give it a try, and make an educated guess, and if you are wrong, move the piece on to the next hobbyist without taking a large financial hit. In fact, with the economy in a shambles there are some very good deals to be had right now in both new and used gear. Good luck and let us know which way you decide to go. Just be sure to keep focused on what this is all about and that is to connect with the music in a deep and enriching way.
But, assuming that the former is true. At the $3000.00 and below price point, an integrated amps makes a lot of sense. No matching of components is involved, one less pair of interconnects to buy. You are not saddled with a great amp and a preamp that underperforms. Not that a Mac wouldn't sound nice with a Metis preamp, but this is a completely different price point than a Primaluna, so I think that you will have to make up your mind about your budget first. Even if you had the cash for the Mac/Metis combo, I should think that you are better off still buying the integrated and using the rest of the cash to upgrade your sources, speakers etc. You will not want to listen to an unbalanced system for very long.
So let's assume, for a moment, that you want a tube integrated. There are some great choices that are made in America, like the Rogue integrateds, Manley, VTL, CJ, Audio Research. Pretty much all of them will be available in the $1500.00 and under price range, used, on this site. But to answer the other part of the question, the Primaluna may, or may not be enough power. And that depends on how big your room is, what your musical taste is, and how loud you listen. The nice thing about this site is that you can give it a try, and make an educated guess, and if you are wrong, move the piece on to the next hobbyist without taking a large financial hit. In fact, with the economy in a shambles there are some very good deals to be had right now in both new and used gear. Good luck and let us know which way you decide to go. Just be sure to keep focused on what this is all about and that is to connect with the music in a deep and enriching way.