Hi,
I have a pair of BeoLab 4 on my desk at work and they surprise most people by their sound.
In your setup, I would say they could be a good option as the surround speakers in a 5.1 system, however as main speakers with such a powerful center BeoLab, they would probably be left behind.
If you had a subwoofer, it would be quite a different story and they would become the perfect choice, I think, since they are the most compact BeoLab and would not have to struggle with bass reproduction.
If you can, I would suggest getting a pair of second-hand BeoLab 4000 Mk1, that would be a step ahead.
Reunion Island is greeting you!