I’ve been a dedicated Salk and Dennis Murphy fanboy going back to 2004, essentially as long as I’ve known them. All of these speakers feature a flat frequency response curve across the entire midrange, and an over all neutral balance. They all have excellent off-axis response that leads to a wide and realistic sound image. Because of that, they all share a common sound. The differences tend to come at the low and high frequencies where higher price will buy cleaner sound. I might be biased, but in my opinion, these speakers sound as good as or better than anything else I've known. There are other very good sounding speakers, but they almost always sell at higher prices.
My first experience with a Dennis Murphy design was in 2005 with a small DIY 2-way speaker I built, called the CAOW1. I still use them. The CAOW1 is essentially the same as the Salk SongSurround I – same cabinet dimensions and drivers, but with 2nd order crossover slopes instead of the 4th order slopes used in the Salk SSI. I’m pretty sure I do not hear a difference between speakers if they are identical other than the crossover slopes.
In 2007, I bought a pair of Salk SongTowers (ST) and have been an enthusiastic fanboy ever since.
Recently, I replaced the SongTowers with Salk Veracity ST (VST) speakers. (I was going to sell the STs, but my son wants them.) The VSTs are similar MTM tower speakers with more expensive woofer and ribbon tweeter. The woofers are similar (6" instead of 5½") to the woofer in the SC SongSurround, and the ribbon tweeter is identical. My own experience listening to the different drivers in the CAOW1 and ST vs. the drivers in the VST is what leads me to say the SC SongSurround is in a class above that of the Revel or Dynaudio speakers you mentioned. I have not made a direct listening comparison. I have, however, have directly compared my DIY CAOW1s with KEF LS50 speakers. They are not identical, but in my opinion are equally satisfying. The KEFs retail for $1500, and the Salk SongSurround I sells for $895 plus shipping. Nuff said!
I urge you to call or email Jim Salk and Dennis Murphy. They know each other well. Both are very good at talking to people, such as yourself, about these decisions. They won’t try to oversell you with a higher priced product.
I currently live in W. TX so, unfortunately, I do not have the ability to visit Salk or Murphy.
If you contact Jim Salk or Dennis Murphy, they might know of someone closer to you who is willing show off his speakers. There is a forum dedicated to Salk speakers
http://www.audiocircle.com/index.php?board=82.0 . At the very top is a thread for speakers that Salk has available for immediate delivery.