Thanks everyone for your advice, much appreciated!
As for budget, I wouldn't move that far away from what a aqua terra costs -- consider my very first intention, as a naive watch outsider, was to reach for something nice enough in the 1k range (sinn for example), but reading these pages is, as someone correctly said, a first step to want more and more watches of different kinds.
The RO,however beautiful, still remains out of my league. I also think I'd need to learn something more about watches before being able to fully appreciate it beside its design.
The Explorer I might be a good alternative, especially if I can find a used one in good state (and this would be necessary, since they're out of production in favor of the II, if I'm not mistaken?), but I tend to appreciate number-less dials more. The datejust is more appealing in my eyes.
The IWC ingenieur seems too bulky for my wrist, but I might be wrong, since I never had the chance of seeing it in person. I like its plain, classic and clear dial though.
Lastly, I didn't know of the Cartier Roadster, which, after a quick glance, I like. However, I think its particular style and design might tire me after some time... It's a niche watch tough, and I'll certainly consider it when it will be time for my next purchase! Oh, no, wait...
Wore this today wootx
Got his and hers too, Duchess never takes hers off