Under 1500$ Solid State Amp for Usher Be-718

I don't think Musical Fidelity is considered a warm sounding amp. At least this is my experience with their onlder gear. I have not heard their newer stuff.
The Usher amp does, in my opinion, have a very good sense of midrange warmth and does quite wel with the Usher 718 speakers.
Any of the amplifiers mentioned would work just fine with these speakers.

I used to have BE-718..but didn't really like the bass. At least 200wpc for the spkrs to perform the best...imho

Noticed there's a nice McCormack DNA-1 Rev A available now for $1400 that might pair nice with the be-718s. Best of luck.

How about Usher R- 1.5 Power Amp for
tube like presentation and good midrange
and Bass.

There's only one way to get a tube like presentation and that's with tubes. Some solid state amps, such as the Usher, are a but warmer in comparison to other solid state counterparts. The biggest difference in in harmonics where solid state cannot give you the same 'tone' as tubes.

The Usher amp is very smooth with excellent dynamic control. One of many good options.