Cakewalk
The only reason I really brought up Cakewalk is because I've had stability issues every time I've tried to use Cubase... pops and clicks and locks things up, on a number of different stations. I've checkout out Logic, but have no experience with it, and the ProTools stuff is rather proprietary and doesnt play well with others, and alot of people on Digidesigns forum are bitching alot. Cakewalk is nice and stable, for the most part, and Sonar may actually be a step up from Cubase, maybe even easier to use. All subjective, I guess... pends on whatcha want/need/like/desire... I'm going Sonar for now, probably Nuendo when they get the main bugs out.
Peace,
Paul