I'm currently leaning towards the RAT 9, as I think wireless may actually be nice...
I've read plenty of reviews of the RAT 7/9 and overall they seem to be held in high regard.
The Logitech G700 looks rather nice too, but I haven't read much about that one yet.
My current concern with the RAT mice is that the rear part of the mouse seems to be raised quite a bit (though maybe you can lower it). With the Lachesis I rest my wrist behind the mouse - if that makes sense, and then sort of have my hand over it, rather than actually on it.
I assume this is the case with most mice, but it's difficult to tell!