I recognise that quandary!
I've heard the Beovox Pentas with a Beomaster 8000 and fine loudspeakers they are. I've even considered buying a pair but for a variety of reasons - mostly aesthetic, I chose not to.
I've had a pair of Rosewood MC120.2s for 4 or 5 yeas now and have used them with, amongst other things, the Beomaster 8000, a Beocenter 7007 and a Beosystem 6500. Whilst I appreciate they are excellent loudspeakers I really hanker after a pair of Beolab 8000s, particularly to partner the 6500. I know the limitations of the 8000s but I can live with those. They are simply, the most beautiful of loudspeakers.
So, for what it's worth, I have decided to sell on my MC120.2s (currently on sale as part of a 7007 based system on a well-known auction site) with every intention of using the funds as a contribution toward buying a pair of Beolab 8000s. I guess this is the question. Can I live with the limitations of the 8000s for the sake of a piece of stunning industrial design? The answer is a very definite yes.
The other thing is my partner hates Rosewood!
Cleve