This, Massive and my Roland MC-303. 
I use Razor for pretty much all my basses. I know most everyone loves Massive but I find it sounds too generic. Razor instead gives me a solid sound i can modulate and sculpt with other saturation and filter plugins.
Izotope Alloy is another VST i use heavily, it’s great for really bringing sounds to life.
Some people just use Ozone but the zero-latency mode is great to jam out melody ideas on a synth when you have your instrument sound worked out.
+1 for Razor. The intuitive flexibility that it gives you is ridiculous. Best part is you can really easily get the most f***** up sound
Sylenth 1 is probably the single best purchase I’ve made. Other than Logic Pro and Waves of course.
if you’re looking for something free & bit different I’d recommend:
DSK Indian Dreamz
DSK Asian Dreamz
synsect
AM TB30X
CMT Bitcrusher
This page has quite a lot of good stuff if you’re going for a more lo-fi/video game sound:
All Waves total package FTW.. There are so many great plug-ins within that bundle. =)
Regards,
EKSi
Basicly:
-reFX Nexus 2 (Lots of Prog House presets, my main genre)
-Sylenth 1 (Basses)
-MiniMogueVA (Analog Synth)
-NI Massive (Working on Electro Sounds)
-IceCream (Chiptune)
-All the Tweakbench VSTs & Plugins (Also for Chiptune)
-Harmless (Chords)
-Dada Life’s Sausage Fattener (This is a Plugin, but it’s just AWESOME as a limiter)
It’s not too much but I think it’s OK for a beginner like me
An old freebie I just started using - fxpansion orca. Simple as hell, sounds fucking great.
Generators: Massive, Sylenth, Harmless, 3xOsc, Nexus
Effects: Bitcrusher, BoomComb, CamelPhat, Camel Crusher, Ohmicide, D16 Devastor, WOW
Massive is my favorite. I sometimes use FM8, but I still can’t figure it out completely. x3