Speakers choices for AR REF-5/75s

Hi Erik-Using Ayre Codex DAC with an ARCAM CD player as transport.
Room treatments- Tapestry on back wall to lessen reflective noise.
Speakers are toed-in using the Audio Psychic positioning placement "secret formula."

Listening yesterday I realized I want bigger sound. If this makes sense, the equipment upstream wants to sound bigger, but the speakers won't let that happen.

What sort of music do you normally listen to and how loud? I probably don't have as wide of a hands-on ownership experience as some of the old timers here but all things equal when it comes to speakers in particular, I'm convinced that certain speakers sound best for certain types of music which sort of indirectly implies how loud they are played. I don't know if it has to do with how pressurized the room needs to get for certain speakers to come alive or something else. Not sure others agree.

You will probably enjoy a horn loaded/based speaker like the Avant Garde, Tannoy Canterburry or even the Zu Audio. They will sound much more lifelike and present.

Kalali-I listen to everything except what my 15 and 20 year olds listen to-dub and rap.

Pani-never considered horns. Like an irrational fear of clowns I guess. I will give them a listen.

What about hybrid electrostats like Martin-Logans? 

I have a pair of older Martin Logan Aerius i speakers driven by a yet older McIntosh MC2200 amplifier. Certainly not quite as refined as the ARs but I feel the speakers suck every ounce of (200wpc) power from the amp with the volume at moderately high levels. I think the 75wpc amp may be a little strained depending on your room size and listening habits. But amp aside, I personally find electrostatics sound an acquired taste. While they sound detailed and create a decent size soundstage, they have an extremely narrow listening sweet spot that can be annoying. Definitely try them first before you commit. With a solid foundation like the ARs, you have a lot of speaker options to choose from. I've heard your amp/preamp combo with a pair of larger and older stand mounted Aerials - not sure which model, maybe LR5, in a moderately sized room, and I was really (really) impressed. Definitely sweeter sounding than my set up.