I use Nectar 2 for vocals, alloy 2 for tracks, and ozone 6 for mastering. They work well together, and you also have the option to group vocals or certain instruments on buses, then use tools such as alloy or nector to avoid the bit CPU hit--and it is a big hit, IMO, if you use several instances of each plug-in.
I find the ozone mastering to be very useful in giving a final sheen to a well-mixed project, and I prefer it to just doing everything in my mix. The final results can be subtle or striking, depending on what you are looking for in your final product. And I have only scratched the surface, mostly using their presets. I believe that if you tweak your presets, experiment, that over time you can accomplish a lot with these particular plugs. It's not as EZ as EZ mix, but I think the multitude of presets, combined with the infinite tweakability, make it a more useful tool for all types of music. I've used it on original jazz, pop, folk, and on many cover tunes of similar styles, etc. It's pricey, but sales happen, and support seems pretty good, too. I live in the same state as the company, so I like supporting local businesses (Sonar, too is in my home state of MASS).
Hope this helps.