If you like the monitors' crisp sound you probably won't like the SDAs, at least that was my original feeling hearing them on a few occasions years ago, I thought they sounded muddy in comparison. Actually, the new Polks are quite good (at least the LSi 15s I heard, which I thought was better than my recollection of the monitors), so I wouldn't dismioss them as junk.
Polk Audio Speaker Search
I currently own a pair of vintage Polk Monitor Series speakers and run them on all McIntosh equipment. I bought a pair of McIntosh ML2 speakers to compliment the system and was kind of disappointed in the sound. They had a wide ranging, beefy response, but not that punch and snappy clarity that my Polks bring to the ears and senses. I know that Polk currently makes junk, but wondered if there's a pair that is similar that will fill a bigger room. I'm not specifically looking for another pair of Polks, but something similar to the crisp, thud in your gut feeling I get with my current Monitor Series speakers. I've been looking at the SDA Polk speakers, but don't know anything about them and some people have steered me toward B&W. Any thoughts or advice?