If you're on a mission for a Grand Seiko, you could take the money that would be spent on a new watch and apply it towards the GS. But where’s the fun in that!
As @KristianG mentioned, the Marathon Navigator is a great choice. You’re Terrific has a good video on it:
https://youtu.be/hfmlwnOieLA
Recently squired the Seiko SNE573 38.5mm solar diver that is incredible for the price (~ $350 on eBay) if that’s your jam; highly recommend it. There are also plenty of micro brands with a lot of bang for buck. Nodus and Lorier are a few brands to look at / keep an eye on. Happy hunting!