Speaking to a sponsor is definitely a great place to start.
First question most on here will ask is do you have a grinder? If you dont already you should budget for one as its the only way to get a truly good cup.
I own both a 6910 and a Lelit (branded as a Quaha but same machine). *Both are capable of making an excellent cup of coffee. *The big advantage of the Sunbeam is that you can brew & steam at the same time. *It also has more steaming power for texturing more milk at a time. *Wth the Lelit you have to brew first the wait for the boiler to heat up for brewing.
Have you ever tried texturing rice milk with steam? *Ive had no experience myself but would say its worth a try.
Considering your usage, steam power is not important so I would lean towards the Lelit or Silvia. *These machines will offer greater reliability and longevity. Any machine needs to be well cared for of course to get the most out of it.
Its not essential to PID a Silvia, just follow a few basic rules to extract at the optimal time. Lots of information about that.