I'm also sticking with SPlat for as long it continues to function.
I've also downloaded the trial versions of all of the DAWs mentioned in this thread.
I uninstalled Digital Performer after a day of trying to read the tiny font size on it's interface.
I gave up on the others as well. The only one that I am continuing to try out is Studio One. (I even completed a whole song with it) It's got the easiest learning curve, and while I think it's GUI is crap compared to Sonar Platinum, it does everything I need it to do. So yeah, Studio One is my first choice if and when Sonar becomes unusable.