The 38mm Hamilton Khaki Field Mechanical is a minor classic but I'd have thought would be out of budget, and the new quartz ones (38 and 34mm) have a different dial that I'm personally not as keen on.
I like that - very clean.
I was after a similar watch for a similar budget and ended up buying a cheap and pretty well-worn 8260, which makes a great beater. I guess a bit like a g10 but with better water resistance.
Depends if you want mechanical. At that price, if you do, it's mostly Seiko.
For me a field watch should be sub-38mm, ideally 35-37mm. The smaller (36.5mm) SRPJ Seiko 5s are a great release in that genre, I think:
https://www.seikoboutique.co.uk/product/seiko-5-desert-kit-midfield-sports-style-srpj83k1/
https://www.seikowatches.com/uk-en/products/5sports/srpj81
Very similar to the SRPGs, just smaller.
The 38mm Hamilton Khaki Field Mechanical is a minor classic but I'd have thought would be out of budget, and the new quartz ones (38 and 34mm) have a different dial that I'm personally not as keen on.
A leftfield choice would be trying to find a quartz Seiko SUS reissue (35mm), eg https://www.sakurawatches.com/seiko-selection-sus-design-reprint-model-nano-ยท-universe-special-edition-scxp155 from one of the Japanese exporters like Sakura.
I have one in the dark grey case colour that I love. They need a strap upgrade from stock though.