It would be great if it had an extra pair of inputs as well in case I would like to plug in my phone or some other device. But that would just be a bonus.
Yeah I would generally advise going one "level" above the bare minimum you currently need for the flexibility and growth that offers.
With all that in mind, something like the Scarlett 8i6 should fit the situation nicely. I have no particular affiliation with Focusrite though and if you or anyone else knows of another unit with similar or better features/quality for less money, by all means go that way. I'm mentioning them specifically just because I have some personal experience using the hardware and software.