I think beryllium gets a bad rap because the tweeters are often elevated to highlight them. But really the material self damps and has far less ringing than other materials. Revel’s tweeter/tuning is super smooth and a hair rolled off if anything. They are easy to listen to at any volume. There are lots of measurement around of them that show they are lower distortion. The details are always there but never forced.
I sold them simply because I found a speaker I like better (the JBL 4367) which is tuned similar (a touch more rolled off in the highs and a bit warmer in the 90-100hz range). I found the JBL to be more dynamic, detailed and generally sound more like real instruments but this is not fault of the very good revels (direct A/B comparison in my own room). The 4367 is just special. The downside is the sound stage is much smaller on the JBL due to much less room interaction (narrow dispersion both horizontally and vertically) and it is the ugliest speaker ever created.
the revels really do no wrong, they have no fault but they don’t really stand out either. I could not listen to revels without subs. Highpass at 60hz makes them super enjoyable. The sounds stage is very wide or as wide as the room will allow. It is not as deep as some speakers but not bad either. It is very stable even when moving around the room with a wide sweet spot. They do all the technicalities well. Compare to cost no object stuff the revels could use better front baffles and crossover parts in the sub network. The fit and finish is so so and they look a little tacky to me (picture of my system in my profile).
I am sure there are other speakers that meet your requirements, the Revel be line is just one I have heard. For example I found even the Sonus Fabor Olympica 3 brighter in the treble (also a touch scooped out in the upper mids) and more round in the mid bass.
the short version is I would own the revels again. I could to talked into a pair of 328be or Salons pretty easily. I would have a hard time over looking Revel in general if price is an issue. The F208 gets pretty close to what can be done for a very modest price. The 226be or 228be on sale/used is a good buy too. To better them I think more specialty speaker with associated prices are required (think Vivid, magico, etc).