It's been quite a few years now, and my RSI type issues have reduced a lot in that time, but I'm not sure it's really cutting it anymore. Starting to get wrist pains again. So I think it's time to up my keyboard game, but things get expensive going to the next level and the choices are kind of overwhelming. So I'm just hoping for some recommendations really.
I'm a programmer so that's an important factor, I don't want some weird key layout that's good for typing English but rubbish for programming. But I also don't really want to spend loads of time fully customising it. But I'm happy to learn a new layout if research or whatever supports it being better.
I use Colemak DH with a numpad and nav layer (there's a media layer, but it doesn't see regular use) and Callum-style mods for my layout. I code in python, rust, typescript, sql, latex (and other documentation formats).
34-keys is my sweet spot. My daily is typically a charybdis (home) or sweep (office), and I switch between a totem, zaphod, and 34-key planck periodically.
The key to my layout is callum mods on the left hand layers, with command modifiers underneath (i.e., zxcdv) and alt f and b above. W and Q positions are transparent.
The nav layer is on the right hand, with about what you'd expect (arrows on home row).
The numpad is also on the right hand, and I use the num row keys instead of the numpad, so I get all of my symbols there, too. Various brackets are combos on the num layer (in QMK; all layers in ZMK).
I also have combos for (semi-)colon, tab, capsword, and underscore. And the media layer.