You probably already know about these two but I'll post them anyway...
Many of us have used David Klass and have been very happy with the engraving. I believe Sako who does CVB settings is also
good but I have not used him.
I have seen a couple of threads on this but one was not updated and the other was also older and band was straighter. I have a plain gold band that is thick and heavy (6.5 g) and almost 5mm. It's comfort fit and bc I have upgraded somewhat with a high carat plain band, I was thinking of jazzing...