Advice for picking an interface? :)

Hi all! I'm in the market for a new audio interface. I don't record audio, I just use it with my PC to connect my monitors and my AT2020 microphone. I currently use a Behringer UMC22 and looking to replace so I can have a separate monitor and headphone output knob. I'm also specifically looking at Scarlett interfaces because apparently they're great on Linux. I want to avoid overspending on features I won't ever use, what would be a good interface for me to get? I've been eyeing some 2nd hand 2i2 and 2i4 interfaces on ebay. Thanks!