Well, and I have to say I don't know the Aby breed (though they sound pretty cool)... I do have a Mau, and I've been looking into a Tonkinese.
I would say to take a look at the Tonk, as it's a cross between the Siamese and the Burmese, has the coloration .. and from everything I've read.. has the good attributes of both breeds. I've read that they're not as vocal as the Siamese, but that they do like to do things like ride on your shoulder, are very people oriented, like harness and leash training, like to go everywhere, visit with everybody.. and I was just sitting here thinking that it might be perfect for you.
Now, my little Mau.. she's about 8-9 pounds, and petite. When you pick her up.. you're pretty much astounded by the weight. You'd never think she weighed as much as she does to look at her. She is the one to sit back and observe. She's the shy timid one, although, that being said.. *none* of the other Maus at the breeder were nearly as timid and shy as she is. She is actually something of a rescue.. she was bought by someone else, shipped, and then contracted an eye infection for which she was being treated by the new owner, who was also trying to turn her into a shoulder cat and basically wouldn't let her down. The breeder asked for her back, as she really felt that it was doing harm to the cat's personality. And when I got her.. she was quite a bit of a lunatic. She's unlike any other cat I've ever owned, though, and while we certainly thought that we'd *never* be able to put our hands on her, pick her up, or do anything with her when we got her... she came around and a lot faster than I could have ever imagined possible. They're extremely intelligent. She'll sit there and watch you like you're giving a lecture and she's taking notes. Out of all our cats.. she's got the best ability to logic things out.. or make more extensive logical connections.
That being said.. she is shy, but she's got a history and a reason. Even being the shy one, she still doesn't run from company, while the Bengal .. you'd never know he lives here. He is completely anti-social.. but that's another story. I agree that they like their surroundings.. and she really hates it when her surroundings change. She absolutely does not feel the need to explore and be adventurous.
If you'd like to see a picture of a bronze.. I have pictures of her on the pictures forum, both under the sleeping kitties thread, and the one I started with my favorite pictures.