As far of my long time experience and knowledge there are only few candidates that are in same league that could replace SONAR X2 x64. 1. Cubase Nuendo
2. Samplitude PRO X / Sequoia
... not there yet...
... 3. Studio One (Not ready for real work)
4. Digital Performer 8 (windows)
... lower list.... 5. Logic Pro -Its not as it use to be. a drag and outdated platform that limp behind every year.
6. Reaper (Not consider as a professional DAW)
7. LIVE -not a DAW its a rewire application
8. Reason - not a DAW its a rewire application
9 FL Studio - not what I call a DAW
10. Tape mashine
11.....
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15..
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20. Pro Tools HD - a DAW that has lived under a rock the last 15 years.... Only DAW that only works on Windows 95 and XP32. Only DAW on the market that are still in x32bit only 2013 and have no new technology functions and totally outdated.
The latest features were non destructible faders and record and working with 32 bit files? All other DAW has had that since the late 90ths.
today you can't find any functions that Pro Tools do better then other DAW. Actually it's the opposite. all other DAWs do it 10 times better.