Obsolete in what sense? lack of 7.1, DTS-HD, HDMI switching, etc? I currently have four speakers and it will be a while before I even care to buy a center channel, so basic DD and DTS will be plenty. As long as it's clean and has excellent presentation. I'm more concerned w/ delivery of music than having latest features. Video switching, etc is very nice but not a must. As mentioned, if the difference in presentation is significant b/w a surround pre and stereo pre, I'm willing to just forget surround altogether.
I've done some more research last night and am now heavily considering Sunfire Theater Grand III processor. If I can be confident that the difference in sound presentation b/w this unit and the highly regarded GFA-750 is marginal, I'll get the Sunfire. Furthermore, if the same is the case w/ the Sig 2.0, I'd be even happier.