Если у тебя Виста, лучше Сонара пока ничего нет.
Цитата из журнала Sound on Sound:
Sonar 6.2 is a free update for existing users and takes advantage of new features in Vista such as WaveRT driver support for enhanced CPU performance at low-latency playback settings, and MMCSS (Multimedia Class Scheduler Service) support to give the Sonar audio engine prioritised access to CPU resources. On 64-bit PCs running Vista in 64-bit mode, Sonar 6.2 users will also experience benefits that include enhanced CPU performance and the ability to access up to 128GB of RAM. These are the sort of important Vista-related improvements we've all been waiting for!
В общем, преимущества Висты пока дает только Сонар.
А последняя версия Cubase вроде 4
про оба редактора можно прочитать большие ревью в журнале SOS:
3,6 mb pdf