A great "synth" in my opinion would be Massive. I can't call it. But its variety of sound and design is just the best for hip hop.
Hypersonic 2.0 is a good "general" rompler.
And Nexus is my favorite. I'm experimenting with Omnisphere.
SoundClick artist: These Beats On Fire - Today's Best In Hip Hop & R&B Sound. MG The Future & Tommy D, "these beat's are fire!" Thesebeatsonf
Here's something i did today with the pan laws off with omnisphere and urban fire 5.