Thats too bad about the build quality. I have a 7100 now, and that thing is damn rugged! I was riding my bike the other, and the phone fell out of my pocket the other day, and bounced about 3 times on the pavement. A couple of scratches, but that's it. When I turned around to go get it, I really expected it to be in several pieces!
I'll still be first in line for the TMO 8700, tho. I just won't expect it to last as long! ;)