I own a HDR Pro Lexus monoflap, and its seriously wonderful. Weighs nothing, its very close contact to the horse, and it has very deep knee rolls. The seat is a very narrow twist, I love it. However, since its a monoflap, the girth gullets attach about knee level so those saddle pad straps do not work. So right now, I've been putting saddle pad straps around the front to my strip leathers, that's my only complaint with it.
My mother has the Toulouse monoflap, she also loves that. The twist is much more broad through the seat(not sure how to describe that?), the knee rolls are more along the front edge. I have long legs and it feels like my knee caps touch the knee rolls; whereas on mine the knee rolls rest up against upper front thigh and curve around my knee.
If possible, id suggest a road trip to somewhere with a ton of dressage saddles and sit in them until you feel the perfect one. I used to live in Michigan and we had a store called Classic Saddlery, that we both went to and honestly when I sat in mine I knew it was true love. That being said, I did see your other thread about your legs not being tight enough against her side; and honestly a saddle isn't going to change that a ton. A bad saddle wont help your position, but training and lessons will make a bigger difference than a new saddle.