This is old news dude. We've had Presonus, Cubase, Protools and others all making offers towards SONAR users in these forums some days ago.
You need to weigh up the pros and cons. Presonus doesn't support MIDI so that DAW is dead to me! Cubase requires the purchase of a hardware dongle permanently engaged in your computer so that DAW is dead to me. Ableton live looks like Lego and I don't like the workflow. Logic I like but that doesn't support MIDI and nor is it available on the PC.
ATM, the only one which looks viable to me is Mixbus because the look and feel and workflow seem similar to SONAR, it supports MIDI and doesn't require a hardware dongle plus guess what? They're also doing a special price for SONAR users - funny that!!!
They've all got pros and cons so you need to decide what fits you best! :-)