I did the same thing some years ago. I chose purelymail[0] as the MX for my personal domain and would recommend. The only issue is that it's so cheap, and my credit lasts so long, I forget that it is in fact a paid service and that I do actually need to make a payment from time to time...

[0]https://purelymail.com/

How do you like the RoundCube webmail UI?