If you feel like spending even more, the upgrade to Studio 4 is really well priced right now. Right now the difference within Sonar is in some workflow enhancements, cool sound design possibilities, a few extra algorithms and the possibility to see "reference tracks" in Melodyne, e.g. for when you have to "aim" backing vox at a lead part. It was implied that true multitrack editing might be possible in the future (e.g. for multi-tracked drums). In fact it already is but not through ARA, so you'd have to manually transfer audio.
Plus being ensured of continued support with the latest version of course.
Editor 2 is still a great product by the way, it's just a good deal to go to the top version at the moment.