which budget integrated amp Rotel, NAD or other

The Brio 3 should drive those Ushers without a problem.
The binding posts and RCA connections are not the highest quality, unfortunately. The source select and volume pots also feel a little cheesy, but they work fine.

One of the best integrated within $1.5k budget for me was used Krell KAV300i. It might be more expencive, but often available used and obviously better for Usher than above mentioned Nads, Rotels and Regas.

Perhaps an intergrated from Musical Fidelity? The A3.2 has 115 watts per and phono. Any comments on this?

One of the best integrated within $1.5k budget for me was used Krell KAV300i. It might be more expencive, but often available used and obviously better for Usher than above mentioned Nads, Rotels and Regas.

I nominate the Onkyo A-9555. It puts out 85/170 wpc into 8/4 ohms, so it's a good match to your requirements and your speakers. It's very quiet, fast, and transparent. I personally prefer it over the Rega integrateds and many of the other British integrateds which are either too forward in the midrange, too wimpy in the bass, or both. It requires a good 100 hrs to break in, but transforms into a smooth, yet detailed, dynamic amp with very low noise floor. It has so much current it replaced a 150wpc high current power amp with no perceptible drop in weight, but a significant gain in transparency and speed without turning edgy.

The built-in MM phono preamp is pretty good too. It doesn't have the greatest slam, but it's very musical and excels at inner detail.

The speaker terminals are those weird things like the 1st gen. Cambridge Azur series had. It accepts only bare wire or bananas, but it's worth it. If you shop around you can pick up this $799 amp for under $500. Try Amazon and B&H.