I've owned a few different pairs of Maggies, going back over thirty years. Love them! I'm sure others will chime in and answer your question but, for me, your question is purely academic. In other words, it's an interesting question with lots of answers but it's mostly beside the point of your speaker search.
We can debate "true ribbons" and bang-for-the-buck, etc, but the first and most important question you need to ask is: what size will work best in your room? Everyone talks about the space Maggies need, but until you've owned them, you can't really know how true it is. If you have a room that can handle 1.7i's, they're lovely. (That's what I currently have in my relatively small room.) If your room can do the 2.7i's, better. 3.7i's? Now you're talking! If I had the room and the budget, I'd get the 3.7i's.
In other words, get the speakers that will work in your room. If you've got a small room, don't try to jam the bigger models into it; won't work. If you've got a ginormous room but can only afford the .7's, get a different speaker. (They'll sound nice but won't give you what you want in Maggies.)
You might have better luck if you name your budget (don't forget the amp! and subwoofers???) and describe your room. In a smaller room, with a good amp, the lower end of the line will sound beautiful. People love the LRS and .7's. If you can afford the 3.7i's and have the right room for them, they're majestic. But you'll ... need ... the ... right ... room.