I tend to keep speakers/equipment and use it until it fails/wears out; accordingly I have only owned a very few speakers/systems worth mentioning;
Stacked 2 pairs of 2 EPI 100 speakers vertically on stands and used them with a home built sub for 20+ years
in various configurations; bi-amp, stereo and 5.1...
When the drivers started failing (~2 decades go) I inventoried the local audio emporiums and found a pair of NHT 2.5 I towers that closely emulated the sound of the EPIs (though not as smoothly); appreciated these for about 20 years mostly in stereo and 5.1 configurations; until they were blown out by a S**y attempt at a room equalization program... (in fairness; they were pretty old).
...Sought some replacement towers and gambled on a pair of polk r700s ... (I rate them, at best as; as fair to good). Santa; hear my plea and bring me a better pair of main speakers...
While attempting to get acceptable sound from the polks I have acquired;
an SVS ultra Center channel speaker (I rate it as very good).
and a RSL 12" Speedwoofer, subwoofer (I rate it as very good to great).
The blown NHTs have been partially revived using some highly rated replacement mid/bass drivers and some modified (turned the faceplates smaller to fit the speaker boxes) titanium tweeters from parts express and are currently serving as rear speakers...
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Currently my last pair of EPI 100 bookshelf speakers are being renovated... up dated/upgraded tweeters scheduled for delivery Tuesday...
Enjoy!