I am currently restoring my beosystem 5000 and I trying out several speakers.
I live in a fairly small appartement so I need something rathar compact sized. The R60's I used to have did a fairly good job. Better than expected I have to say. (but they had just been restored as well). The cx100's (4pcs) I have hooked up right now seem to do a great job. I think they do a decent job for their small size and are probably best paired with the beomaster 5000.
I did have a chance to try some newly restored penta's but they seem to be too powerfull and inappropriate for the amp in this system... they sounded good though. However they sounded even more spatial when they were wired for used their own amps.(That's what my neighbours told me.....) But again too bulky size of speakers for me and the misses made me sell them asap.....
Most beovox speakers are fairly simple and easy too fix up. The cx100's are easy and cheap to refoam. They could do with an extra boost in the bass departement but it turns out fairly ok in my space. Maybe it's the high ceilings......or the fact I'm using 4.....
The RL60.2's are another story..A little more skill needed for those. I still see them as a worthwhile speaker but it's baselevel is very position dependant but very capable of producing decent sounds (especially with new drivers!! and cross-overs) . In my opinion a very underrated speaker if , again, they are restored properly.
I totally love the penta's, but they are quite a lot of work and more costly to restore. However, they remain (even after all this time) some of the best speakers I have heard.
Regards