clintmartin
A great EQ with mid-side is a nice thing to add. Sonar doesn't have one yet. (The new one coming this year may have mid-side IDK).

TDR Nova has that functionality. And I agree, updating Pro Channel modules with M/S processing like this:
 

 
would be a huge step up.

I'm a big fan of TDR. I have the GE editions of SlickEQ and Kotelnikov. I have the free version of Nova.
Excellent plugins.

No EQ makes M/S easier than Pro-Q2, which lets you mix 'n match Mid, Side, Left, Right and Stereo filters any way you like and presents them in an easy-to-understand graphic. Most equalizers (e.g. Ozone's otherwise excellent EQ) make you look at separate Mid,  Side and Stereo views so that you can't overlay them for comparison. The only real competition for Pro-Q (AFAIK) is DMG Audio's Equilibrium, which has many more features but isn't as quick and easy to use.

BassDaddy
Prob EZ Drummer 2. It's such a big part in the early stages.

 
This goes for me too.

Ozone 5 - can't live without it.

FabFilter ProQ 2

UAD Massive Passive MST for the best sweetening the final product around. IMHO, of course.

THANKS for all the feedback...
i'm making my list,
and checking it twice
 

I don't have a single vocal track that doesn't have Waves Renaissance Vox on it. I also use it on instrument tracks thst are very uneven as well.
 
It pretty much does just one job, but it does it better than any other plug out there. It evens out multiple takes that are poorly matched in volume and intensity. 

Thanks Mark, always good to remind us in this world of Nectar.