Maag is dope--best digital air booster I've heard. CLA bundle is dope--I treat almost all of my vocals with the CLA-2A. SPL Transient designer is dope--I use it to sound design my drums all of the time. They all do different things... If you don't have the Waves API stuff, the collection is worth consideration if you're looking for good EQs--I use these on everything from vocals to kick drums to guitars. Peace.
Look through your plugins and note to yourself what your weakest link is. If it's EQs, compressors or whatever, and look into those. Perhaps you have one lying around that could become your next favorite one, maybe you'll find a great soft tubes EQ that you needed.
Select what you need by thinking about what you need in your mixes. Out of what you listed, I would personally go with the grand summit channel or the transient designer/maag EQ.