I have owned the Jeff Rowland Concentra II and the Mark Levinson 383 of those mentioned - I downsized from a system that included the Utopias.
I never really cared for the Levinson sound in general BUT let me say that the Levinson 383 was the very best solid state integrated I could find.
The Rowland was perhaps the most beautiful piece of audio gear I have owned (and by no means the most expensive) and it had great build quality.
The Mark Levinson - and this is true of all the Levinson electronics in my opinion - is just unmatched in ergonomics and flexibility. The build is unsurpassed. It is a touch on the dark side of neutral and very detailed. At worst it lacks the texture of the Rowland and it can be "buttoned down" but in truth Mark Levinson equipment has come a long way (in my opinion) from the early, more sterile days....By the way, I have always preferred Krell to Levinson equipment (having owned a KSA 300s years ago) and I can tell you NOT to even bother with the Krell integrateds as they are not in the same league with either the Levinson or the Rowland (in my opinion). Can't Speak to the NuVista issue 'cause I haven't heard them.
If you can do tubes and have the money, the best Tubed integrated I have heard is the Tenor.
I never really cared for the Levinson sound in general BUT let me say that the Levinson 383 was the very best solid state integrated I could find.
The Rowland was perhaps the most beautiful piece of audio gear I have owned (and by no means the most expensive) and it had great build quality.
The Mark Levinson - and this is true of all the Levinson electronics in my opinion - is just unmatched in ergonomics and flexibility. The build is unsurpassed. It is a touch on the dark side of neutral and very detailed. At worst it lacks the texture of the Rowland and it can be "buttoned down" but in truth Mark Levinson equipment has come a long way (in my opinion) from the early, more sterile days....By the way, I have always preferred Krell to Levinson equipment (having owned a KSA 300s years ago) and I can tell you NOT to even bother with the Krell integrateds as they are not in the same league with either the Levinson or the Rowland (in my opinion). Can't Speak to the NuVista issue 'cause I haven't heard them.
If you can do tubes and have the money, the best Tubed integrated I have heard is the Tenor.