I was about to make some recommendations, but it turns out I have close to zero knowledge when it comes to what is available in the Eurozone (and with German ISO layouts)
I too like more professional looking keyboards, and traditional full sizes, with a little bit of tactile feedback.
I used to use Model M’s (and Unicomps modern releases of them) exclusively, but over the last decade have shifted towards more modern switches.
I was very happy with Ducky’s OG “Ducky One” when it came out, but those are no longer in production, and their newer keyboards are generally a bit flashier than I like.
I use a WASD Keyboards Code v3 (but set to V2 mode, because I don’t need the advanced macro features), and I am very happy with it.
I wound up splurging for the anodized black milled aluminum case, which would kill your budget, but you don’t have to do that. The base models are more affordable.
I wound up doing this because every keyboard I’ve ever owned in the modern era with plastic cases wind up being worn shiny over time, and I hate that, so I wanted something that would last. I was worried the anodized black aluminum would scratch, but it has been two years now, and it still looks like new.
While I got the aluminum case because I wanted to avoid plastic wear, there have been two side effects that were also positive. This thing is heavy and rigid, and I love it. There is no springiness or rattling to it at all when I type which feels very premium. I don’t know how apparent it is from pictures, but the fit and finish/tolerancing is also much tighter than with a plastic case, which just makes it look premium.
The Code versions are essentially the standard WASD keyboard but with a subtle, professional looking shine-through backlights to aid when typing in the dark. (I am mostly a touch typist, but occasionally my brain gets confused, and I need to take a peek 
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The keyboard itself is very high quality. I got mine with Cherry MX Green switches (the heaviest clicky switch) because coming from Model M’s, I like very heavy switches,that make noise. (I’d get something else if I were typing in a shared office environment, as it would probably bother colleagues*)
With the addition of the anodized black milled aluminum case, the thing is a veritable monolith
The only thing I didn’t much care for were the stock keycaps. For whatever reeason, on an otherwise premium product, WASD Keyboards still use ABS keycaps, and they can wear fast, at least if you are a heavy typer like I am.
I picked up a set of PBT keycaps in a traditional Dolch color scheme on Amazon from some Chinese manufacturer named YMDK, and with these keycaps I like the keyboard even more. They have been in use for almost two years now and still no shiny wear.
At first I thought the lettering on these keycaps was comically large, but over time I’ve gotten used to it:
The final touch, for shits and giggles as an impulse buy I added a wood spacebar to it (dark walnut colored to match my walnut desk) , which I thought mellowed out and made the color scheme nicer and warmer. to it (but unfortunately I don’t have a picture)
This is the product, also from YMDK:
I was ordering extra keycaps from their website in case these which I have come to like wear out) and I just needed a couple of extra bucks to qualify for free shipping, so I threw this one in on a whim. I thought it was funny, and didn’t actually expect I’d use it, but I have actually come to like it. It matches the slightly warm Dolch color scheme very nicely.
I should take new pictures of my desk and working area, but I am in the middle of a huge project and there are boxes and crap everywhere. It will have to wait until I ma done, and I can straighten up a bit
But here is what my work area in my home office looked like before I replaced the keyboard with the WASD unit:
Lots has kind of changed since I took these. New amp, new rug, new keyboard, and of course the aforementioned massive project mess that needs to be cleaned up)
Anyway, my budget for this keyboard went a little overboard (as many of my efforts tend to do) and while it felt a little ridiculous when I first did it, I’m actually starting to feel like it might have been the right choice.
With previous keyboards I have used (even high quality ones) keycap wear, case wear etc. making the keyboard look dirty and oily even when newly cleaned would drive me up a wall. That was the main reason behind my last keyboard replacement, The keyboard was still fully functional, it had just started to look gross. This was definitely the case after six years of using the Ducky One.
Maybe this is just post-purchase rationalization, but the way the anodized aluminum is holding up, I’ll never need another keyboard. If something ever happens to the electronics inside the keyboard, I can just replace the circuit-board itself. The key-caps are also replaceable.
I might actually save money long term by simply not needing to buy new keyboards.
Time will tell.
*At work in a shared office environment I still use an old Ducky One, but with Cherry MX Clear switches. Still heavy, but only a tactile bump (no click) and I installed O-rings on all of the keys to silence the bottoming out (I am a heavy typer who mashes the keys into submission with every keystroke)
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