Thank you very much for all your advice and ideas.
Some of you mention video surveillance. Regarding this, I've read a bit and the conclusion is that they're good depending on every circumstance. Dummy cameras are generally not a good idea for that they're quite easy to be spotted on. A real camera would be difficult to decide where I should place it, because the 1st time the burglar sees it, he may leave, but if he decides to come back later on, he may cover his face and/or sprays it. I think these cameras are a great thing if you can place them high enough not to be reached and easily vandalized.
HerrMannelig wrote:For the locks, having multiple locks would be a good idea. Getting the advice of a local expert on this matter would be ideal.
Yeap, I was also considering 2 locks, just like my parents have at their place. Though both locks may be vulnerable, at least it doubles the time to break in.
HerrMannelig wrote:A way for your wife to activate an alarm or an automated system of some sort would be good.

I like that, provided that she can't move from her bed.
HerrMannelig wrote:And, if possible, a dog would be something worth considering.
Unfortunately we own 3 lazy cats...
fgarci03 wrote:I don't mean to be mean but... If your security is tighter than your neighbour's, they are the targets, not you!
Of course, I agree 100% even though yes, it might sound mean or selfish...but live is a jungle!

ARF-GEF wrote:If you are especially threatened you might consider having a secondary lock as well. Again int1s important to have a good door or have the door reinforced since a weak door stay weak even with the best lock.
I must say, I really like this security bar. I'll have a deeper look at the thickness of my wall to check it does not become the weakest part of this particular security layer.
I understand I should need a lock shield for this one too.
ARF-GEF wrote:FGarci is right there is no need to go to the absolute top with the lock, an EVVA 3ks or ICS would be just as good, and more than enough under a drumm geminy.
Here in Spain I can't buy an EVVA / DOM system. I had a look on eBay and there was indeed a lot of difference in price between an EVVA 3ks and a MCS, so you all are right, I can go for the 3ks and invest the price difference in a lock shield which will add another security layer.
Raymond wrote:...I believe your best approach would be to re-enforce the FRAME and door.
Yes, I do think my door is also weak. In fact I took some pics to show you what you think. It would be silly of me to reinforce the lock, add shields and a bar if the door itself is weak.
I contacted a good locksmith here in the city and -to my surprise- he only advised me to add a shield to my current lock. He may be a honest guy who did not wanted me to take my €€'s on futile extras but...I must say I was a bit disappointed because I actually see many security gaps in my front door.
He recommended me a magnetic shield called
DISEC MG300 to be set over my current ARCU lock. I like this shield though. The magnetic combination key seems a good thing to avoid picking, vandal actions and brute force on the lock. When it's closed, there's no access to the lock. So this magnetic shield may be on pair with the Gemini shield, although the Gemini is made of 64 Rockwell SS, and when opened, the cylinder is exposed only halfway. It also looks way nicer for a similar price ~180€.
This is the Disec MG300:


My lock is an old ARCU lock which was set back in 1985.
It looks like this:

And this is my door (thickness of 50mm) which I consider not to be strong enough against brute force. 3 tiny bars slide when I lock the door. No reinforcement up/down.
What do you think of it? Is it as weak as I see it?
Ok, so after reading all your advice, I think I'll go for this:
- EVVA 3ks Lock
- Gemini Drumm or Disec MG300 (just in case the locksmith had no idea on how to implement the Gemini, I must ask him first).
- A security bar (as shown by ARF-GEF) + lock shield.
-
Anything else? (Door, frames...)
Other thoughts: Now, my final concern (and it may sound stupid) is: Would the "look" of my new fortress be prone now to become a personal challenge for burglars? Or, having all that security on sight, would it make them believe there are a lot of valuable stuff inside? Sometimes, it plays on my mind that if I haven't ever been robbed is because of the lousy look of my front door...

Who knows, though.
Anyway, it's a much better option to be ready and protected despite showing your cards to the burglar (and that he sees he can't possibly win the game in a reasonable time).
Again, thank you very much for all your advice and explanations, they're all very valuable to me.