I offer up no specifics, however some general guidelines. For HT usage, I'd stay away from lower sensitivity speakers in general. The ML electrostats would produce very high levels of distortion products when driven at realistic HT playback levels.
I'd really look at very high sensitivity products, including controlled directivity mid and high frequency designs. Delve into how dynamic compression affects different types of speakers and learn about peak to average "crest" ratios and how important high sensitivity, low compression, high power handling, controlled directivity designs impact the HT experience.
Oftentimes the transition between the sub and the bass driver(s) in the mains is overlooked. One needs significant output in the 200hz. region and below. That means they need to move some air. A single six or single eight inch driver handling that region is likely not capable of high output, low distortion, compression free presentation. This has been a casualty of the sub/sat trend that began in the 90s.
Also, conventional dome tweeters are not high output, low distortion, designs. They are typically not capable of handling the peak demands of high crest factor HT audio, and outputing realistic SPLs, all of which are hallmarks of contemporary soundtracks.
What one gets via these designs is what I characterize as a very transparent sound, with more apparent "speed" and snap to the leading edges of transients. No thickening or sluggish behavior, and no smearing of transient detail. These are what I typically find when listening to less capable systems. These dynamic traits become very easy to discern when one is exposed to typical products, and then exposure to products that place a high priority on dynamics.
IMO, once one experiences the benefits of what these design characteristics have to offer, and how inexpensively they can be attained by prudent decision making, wrt HT...there's no going back.
Now a strictly music only system, doesn't necessarily have the same requirements as long as "live" playback levels aren't required
btw; very important...there is no correlation between price and these design considerations, IOW, one can go this route as inexpensively as any other route