I'm also holding out for the Promedia 5.1's. I bought the Promedia 4.1's from Best Buy a couple of weeks ago. Of course, the 5.1's got announce the very next day. How's that for timing?
I returned the Promedia 4.1's the following weekend. I must say that for the week that I had them, the Klipsch's sounded terrific for game playing and MP3 listening. However, the new 5.1's will have the center channel satellite, the bigger sub, the new standalone control tower, and will be Dolby Digital compatible (DD processor not included). I think that's pretty good value for the extra $100.