Based on what you've stated, I'd start with getting an automatic and something in the size range of 42 is probably perfect; but definitely try stuff on and see how sizing feels for you.
If you don't want a busy looking watch, you don't need more complications (features).
Skip the chronographs, day date functions, moon-phases etc.
Those generally add cost as well, because the watch is doing these from mechanical function which makes for a more complicated watch.
Some watches of the same size will feel larger/smaller too based on the lug length, how the bracelet fits etc.
It sounds like something with less complications to keep the dial simple and perhaps stick dial hour marker instead of numbers.
Perhaps the Omega Aqua Terra line?
It's a subset of the Seamasters and has a very clean design.
https://www.omegawatches.com/en-ca/w...22010412101002
These are also very readily available on the used market and negotiable if buying new.
I'm not sure about the buying a $1000 watch to test things out and then buying another watch. IMO, that could end up a waste of money.
If you're going to do that, maybe buy something used that you can at least re sell for about the same price or close to if you get bored of it.