Tried a few Seiko in person.
Seiko Prospex SRPD25K1 which classify as a "Monster" diver. It's not that big tho, more chunky on the height, deep dial but tight. I like the dark blue dial / cream hands combo but it's too redundant with what I already have. Plus the number font on the bezel are meh and in the neverending magnifying lens for day date debate I lean heavily on "nope".
I tried one of the Presage Urushi dial too. The SARW013 : sadly the shop doesn't have anymore of the three hands in stock (limited edition). It looks really good and all, I like the strap lock too, but it's a bit over my budget. Besides, while I find it very elegant, I already have plain dress watches.
Which is why I also tried the Seiko Premier SRX017P1. It looks a bit huge, intimidating on photos (day, date, power reserve, 24h dial, moon phase complications... A lot to display) but the sensation on wrist is not like that at all (though the white dial version makes it looks a lot bigger... I prefer the blue - pink gold hands though you see less of the good amount of work they did on texturing it). By my standards it's borderline in-your-face and bold but that's the thing : I think the design is good, adds something new to my watch choice and that I can pull it off. It's not an automatic (it's an hybrid rotor weight powering a quartz battery) but you probably couldn't find one with those many features at that price point. Plus having a month energy reserve is a bit of a benefit because setting the time on your automatic watches can get a bit tedious sometimes past a certain point.
I'll keep looking around JDM watches meanwhile.