It is pretty simple to divide up the contenders. Light weight, heavy weight (ie. full functioned DAW), familiar to us SONAR users, likely survival rate, etc.
What I find interesting is the lack of interest in Live. It goes into the more modern looking, ie. emphasis on looping rather than linear recording. Of course, I'm more of a looper.
My 3 favs so far:
Cubase because it is a fully functional DAW like SONAR. cross platform
Supported by a major company for survival.
Linear based like SONAR and a lot of similarities since it goes back to the early windows style. It should be easy to adapt to.
Bitwig as a "modern" replacement.
Not fully functional (yet!) but is good at midi/looping.
A different look and method of operating and has room to grow.
Strikes me as more SONAR sized company but dedicated. Not to be of a leap of faith in sustainability, but having been burned once ...
Mixcraft as the cheap and easy replacement.
I already like the look - the matrix page, the dock, yada yada yada. Simple but maybe not deep, but they have their own programs for stereo editing built in (I believe, haven't had time to check on that or their CD burning) and some other nice attributes that it took a long while for Cake to do (or not as for built-in audio editing). I can probably just jump right in, now that I found the manual, and start a new project, learning as I go along.
Pc only and a small company. They don't just seem dedicated, but again reminds me of Cake with the way they've jumped on this opportunity. A bit of a crap shoot but then it is dirt cheap right now. $100 for a functional DAW? I've already got it. I'm a little worried about the midi side from what others have said, but then I'm not a power user, working everyday with my green music shades on. If I can't play or paint a synth line I'm probably not going to do it. Same w/ audio. I used SONAR at home for my own and friends' music. If they can't play or sing their song I'm not fixing it. A note or two, but not a performance. They aren't clients and paying, so learn to play it right. The most I've used Melodyne for is effect.
My thoughts for the moment.