I originally started my Klipsch experience with a pair of 1996 KG 2.5's that were being driven by a 1978 Marantz Model 2252 Stereo receiver. I accidentally blew the horn in one of the cabinets one day, and I retired the pair of them to storeage, and later gave them away to a friend as a gift.
Eventually I got back into the Klipsch stuff after I bought a Marantz SR7500 7.1 THX receiver. I Bought a pair of RB-25's for the fronts, RC-25 for the center, RS 25's for the surrounds, and an RW-10 Subwoofer. I can honestly say that while a little one the "Bright" or "Harsh" end of the spectrum until broken in, and when driven by an American designed amp, the combination of Klipsch with Marantz is simply Magic.
I once did a demo of my old KG 2.5's and Marantz 2252 for one of my dad's friends, and we played a couple different songs for him, including "Sleepwalk" and "Hollywood Nocturne" from the Brian Setzer Orchestra's "Dirty Boogie" CD, as well as tracks from the 20th anniversary edition of The Dark Side of the Moon. Let's just say that everyone in the room had goosebumps, and the hairs on the back of their necks, and on their forearms stood on end. The sound quality was THAT good, and the soundstage was that open.
I've been able to recreate a similar soundstage with the Refference Cabinets and the newer Marantz AVR. Movie soundtracks are absolutely amazing, especially in DTS soundtracks, with the RW-10 shaking the heck out of everything in my basement with ease, and the tweeters and mids in the other speakers being able to almost tear your face off, without any distortion, and almost no colouration.
I remember when I was looking at other speakers, and I found that other brands like Paradigm that people seemed to be so hot and bothered by, sounded dull and muddy by comparison. I found the same with a lot of stuff made by Bose just couldn't keep up with the Klipsch stuff.
I think that in the future, the only upgrade I might do, is to replace the RB25's with some RB35's...so I can have a little bit more muscular cabinets for 2-channel audio like CD's and Vinyl.
I think unless they do something totally wrong, I'll likely be buying Klipsch speakers for life...