Your usage sounds light enough that you won’t notice any performance difference.

The processor isn’t the only thing to consider, though. The M2 has a brighter screen, better webcam, and MagSafe charging which can free up an extra port for accessories. I personally feel that those features are worth the price difference.

You need a hub/dock that supports Thunderbolt.

Here’s one from OWC if you want to stick with them: https://www.owc.com/solutions/thunderbolt-hub

I still have 2 Months warranty but if IceTea or whatever got spilled on the keyboard apple wont fix it for me unless i pay for it ( so no warranty will apply i guess).

Bring it to Apple and have them take a look?

If the key is sticky because of a spill, then you’re right that it won’t be covered under warranty. But you don’t know if that’s what happened.