rigid steel frame for up to s3 trails & bikepacking

i currently ride an old orbea alma setup with 2.1 tires which is sometimes more then sketchy on some trails and has not many mounts at all.
i feel like the time has come to get a new steel frame bike that endures a world trip and is also able to do some rigid trail action.

what do you think about these bikes?

surly bridge club, surly karate monkey, nordest sardinha 3, kona unit x

what does it cost me to build one myself from the frame up? with decent gear like deore etc.