I’d start with AT&T DSL’s support web site and see if there are any they specifically recommend - I’m guessing they’ll support you with setting up stuff they recommend... :)
I did start there. I looked at what ATT has and all of the modems have bad reviews when cross-checked on a search engine. So, I’m looking for something better than the low end units they sell. For an extra $20 to $40 I can get a top of the line model, but I haven’t decided on which and I’m open to suggestions.