Hi Gary,
"Dr. No" drew my attention to your post as I bought an Omega SM AT last October, partly due to his detailed review of the annual calendar on this site.
As "competitors" are concerned, there were some replies made by other forum members. We usually recommend here not to be guided by such criteria, but rather by personal like or dislike of a special watch. Of course most forumners are very fond of mechanical movements, but if a quartz one should be better for your daughter´s purposes, that´s fair enough.
The details concerning the watch sizes and dials are displayed on Omega´s homepage and I would recommend to see the watches in question "in the flesh", i.e. go and inspect them at an authorized dealer´s place.
I can confirm the accuracy of the 8500 movement, it´s really amazing!
As to changing the strap I can only tell you, that I did the same on my Seamaster Professional GMT one day. Getting the bracelet off and fix a NATO strap was easy. But the reverse (getting the original bracelet back to the case) I could not do! A watchmaker helped me out, but he had no trivial job as well. He was no Omega AD, but nevertheless the bracelet business might prove to be a bit tricky for "home work"
! Also the job of shortening the bracelet should be performed by a professional.
Hope this helps,
anaesdoc
