Sonar has many, many, stock plugins, including some built into the track on the Pro-Channel. And I just bought the IK Multimedia T-RackS 3 Classic suite for mastering on a budget, but am using some of its modules on tracks too.

Anyway, I tend to reach for these first....

1. Pro-Channel QuadCurve EQ
2. Pro-Channel PC76 Compessor
3. Sonitus fx Gate
4. Cakewalk Breverb 2
5. Cakewalk VX-64 Vocal Strip (EQ, Comp, De-ess, etc.)