The updated Logic pro x is amazing! Back in the day I used Sonar and was very happy with it also.
Cubase 6 and Reason 7 (Rewired)
Ableton! I’m gonna try Bitwig when the beta becomes public.
Ableton Live 9 Suite, and currently beta testing 9.1. They’ve now implemented dual monitor support, so arrangement view on one screen and clip view on another. Basically makes the workflow a very powerful process indeed.
Cubase 7. New mixer window is awesome, especially with the second monitor. Chanel strip is also a cool new feature, tape and tube saturation are on a rather high level. And backward compatibility! Which is very cool, means that you can send your project to your pal who runs a previous version of Cubase and he will be able to open it. Tested on Cubase 5, not sure about earlier versions.