Studio One Pro for me.  I have had Artist for a while.  The interface takes a bit of getting used to, but the FaderPort works GREAT! 

I'll likely be taking advantage of the Studio One offer, which I feel is pretty generous on their part. I went through the panic of "BUT I LOVE SONAR!" and grieved but really, I've used every DAW in the past and they're all just glorified tape recorders. The workflow is different on each but after 2 days you get into the swing of it. I work as a professional composer, producer, songwriter, sound designer, etc. It's my full time job. I need something that will last and Sonar is dead and it's likely never coming back to life. What sucks is that if I ever have to re-open any of the thousands of projects I've done 5 years from now (highly unlikely), I'm in trouble. I'll be bouncing out a lot of stems in the months to come...

I'd prefer it if Sonar was still alive but it ain't. So, I move on. DAWS are just tools. What matters is what you make with that tool.

I've been on the Sonar Beta team and allways felt that the Sonar team never really listened to simple suggestions
on making the program more user friendly. Simple suggestions as a tap-tempo,a better tempo adjustment control (a la Cubase) a tuner up front.
Theres other quirky stuff,like the clip handling and the midi editing that I never really liked.
On the whole,Sonar is a great program but suffer from bad decision making that made the program
a bit to awkward to be called user-friendly. To awkward for me as a musician. Many often needed functions hidden in menues and a strange quantization.And I thought and hoped that the Sonar team would eventually lead the development towards userfriendliness for musicians by listening and implementing our humble suggestions.
Insted I felt they were listening to suggestions that made the program more and more capable but less user friendly.
As sad as it is that Sonar is no more but sometimes one need a kick in the behind to move on and stop hoping for something that never will happen.
I like Mixcraft and hope for the developers to keep making it more and more user friendly.

I threw in the towel and got Cubase. Now that doesn't mean I'm discontinuing using Sonar RIGHT NAO or anything, but I decided Id' start working on transitioning to something new.

Well, I just got Band-In-A-Box.
 
If THAT'S not throwing in the towel, I don't know what is.

Back to the OP, yes, I'm throwing in the towel. I am still very much a newbie and it makes no sense to learn Sonar at this point. If I'm gonna spend the time/effort to learn something new, it'll be on a supported DAW. I have no time for tweaking (Reaper) and I don't want to re-learn something every time I sit down to use it. So it needs to be somewhat intuitive (not Cubase). SO3 does that for me.

sharke
To those arguing that people have used old versions of Sonar for years, and that Windows updates never broke them:
 

 
CASE IN POINT:
 
i took my DAW off line, the day i got it dialed in.
 
8 years later, what do i care what windows does?
 
it became completely irrelevant.

I see the wisdom in that Bat. 
I am tied to the web in pretty much any way you could imagine. I guess I'm too far gone to go cold turkey like that.
The web has almost become what electricity now is. 
 
But yeah, you're right. If you can unplug it and not have any other need for that computer on the web great.
 
I'm not that guy. Maybe I should be.

As I've mentioned, for me it's a crossfade. There are some projects for which SONAR is far and away superior to all other DAWs, like loop library creation. For that, I'll use SONAR as long as I can. For projects that can be done more or less equally well on other DAWs, I'll crossfade into those DAWs.
 
I do think SONAR will work for quite some time, although this is just a guess...no insider knowledge.

Anderton
As I've mentioned, for me it's a crossfade. ...

Thanks, Craig, that makes a lot of sense, I agree about SONAR being best in class for some things. 
 
I just hesitate to create a lot of new content in something that is not supported and may break at some point unless I freeze my system, or at least image it so I can get back to a place where it works. 
 
Not a bad choice, but my plan is to put my efforts into learning a new supported DAW.  I can't imagine how you feel over the whole debacle after all the work you put into content creation, all the things you put together for the community and all the effort you've put into this forum.