Having both the 4 and the 4000, for what you want, I'd say go for a pair of second-hand 4000s, they'll be better than the new ones with ICE Power amps, and better than the 4s as well, if space is not an issue. Moreover they come with wall brackets and are very flexible when it comes to placement.
I use my BeoLab 4 as PC speakers at work, and for that purpose, they are great for me. At home they were once used as rear speakers in a 5.1 setup; I wouldn't use them for something else.
Reunion Island is greeting you!