I just wanted to point out something in your examples.
Even though they are the same brands, the difference between a 2i2 and a 4i4 are much more than just the physical inputs/outputs.

The 2i2 lacks the software mixer of the Focusrite models above it.
This was huge to me.
Just posting this in case it may help others in your situation.
If you go Focusrite, the 2i2 lacks an important aspect of all the other models .. not just because of more physical In/Outs, but because of the lack of software mixer.

I've had the 2i2, 4i4 and now the 18i20, and the 2i2 is the only one that lacked a software mixer .. and the Focusrite Control mixer is a very a nice feature for routing and signal control.

I do not work here, but the benefits are still awesome
Make your sound your own!