Waves Complete Bundle is just Amazing.
I personally use a lot H-Delay and TrueVerb and find them to be the best Modulation Effects vsts.
Compression-wise Fabfilter Pro-C 2 Is really accurate and it shows you the realtime spectrum being affected.
In fact all Fabfilter Bunddle is beautiful Pro-Q (EQ), Pro-R (Reverb), and Saturn(Dist.) are just amazing.
I find that Cytomic The Glue gives you a good character when compressing drums and I like it to give those sounds a more “artistical” and fast compression.
On Synths and samplers two friends I did on ADE showed me their songs and I asked what Vst did they use for the piano.They showed me Korg M1. Korg M1 is pretty amazing for this
Future House kind of piano sound.
I used to use Una Corda for Kontakt and it is such a beautiful instrument and really realistic.