I have loved my B&W Nautilus 804 floor standers. They were a bit bass light, but a Velodyne DD-12 matched them perfectly and I had tight non-boomy bass to go with the incredible mids and airy highs. When I close my eyes, the speaker disappeared and I forgot about the system and only heard good music
I have had this setup for about seven years now, but I am at a different stage in life and have a 1.5 year old boy. First the subwoofer had to go because he kept leaning over it and would stick his hands at the back where all the cables are. Now he has started using the 804s as a lampost to grab an lean on. I am in the process of selling them because in a few months he will be able to reach the tweeter housing which is very easy to destroy.
I live in a rental and we move cites quite a bit so cannot invest in custom furniture
So my requirements in new speakers are:
1) They are child-proof. To mean this means, metal grilles so my boy can't destroy the drivers and a heavy base so he can't tip them over.
2) They have very good bass--atleast rated from the manufacturer to the twenties.
3) The mids/highs won't be a massive downgrade compared to my beloved B&Ws
4) Budget is about 5k but a bit flexible.
5) Good 2nd hand value as I do change my gear from time to time. I sold my Velodyne subwoofer for only 25% less than the price I paid 6 years ago, and I already have offers on the 804s that are the same as what I paid for them 7 years ago. Thanks to B&W steadily raising prices on the 800 series, I would have used the 804s for essentially 'free'
The only speakers that I found that match my requirements have been the Linn Isobariks.
They have metal grilles. No exposed drivers down low and the woofers can be separately amplified (Aktiv Isobarik in Linn speak) for better bass.
The Isobariks will be driven initially by by Anthem MRX 700 until a year or so when I will power them with Linn amplification.
I listen to a lot of bass heavy house/electronic music and classic rock (Pink Floyd/Eagles etc.)