I have never owned a pair of Pentas and can't remember how they sound so not able to comment on these specifically. However, I have owned a pair of Mk 1 and Mk 2 BeoLab 8000s with a BeoLab 2 sub and I was extremely satisfied with the look and sound reproduction of this setup for movies and for music. I only used the sub with movies.
As a design statement, together they looked and still to this day look very modern and contemporary adding a real statement to whichever room they are placed in. I was more than happy with the sub for bass; in fact,i t was far too overpowering on many occasions but in a good way, I just didn't make use of it to that depth.
As for the BL8000s when playing music, well to my ears they produced a truly wonderful sound and I was often blown away by them. I would therefore wholeheartedly recommend such a setup. All the best and what a fantastic position to be in. Enjoy whichever route you choose, I am sure you'll be so happy either way. Simon.