Update: My local Best Buy had a Cinema 600 in stock so I went ahead and purchased it since I suppose I can't learn my lesson and I desperately want Klipsch to be my brand, having used them almost exclusively since the early THX Promedia days.
Anyway, I was comparing this new 600 to my old one and found something very interesting. On the back of the bar (as well as on the box), the model number is listed "Cinema 600-2". Oddly, on the back of my broken soundbar, the version is listed as "Cinema 600" which leads me to believe that there was, in fact, some kind of model update in the last year. Hope so, anyway!
That said, so far, so good. My Surround 3's connected straight away (they were fussy getting connected to the old bar) and I'll be damned if the whole setup doesn't sound just a little better to boot. Also, the remote has a different feel than the previous one with the finish being more matte and the buttons have a distinct "clickiness" to them that was missing previously (that's a good thing). I'll keep everyone posted.