I picked SigMod since I already own Aligner, MonoFilter4/Stereoizer3/StereoPlace3.
I applied the $100 voucher to ISL2. Not that I need another Limiter but it was just about the only item on offer that I was willing to lay down a U$Grant for.
Now that I own VSX, SoundID and Realphones Ultimate I can test all three using my Sennheiser 650s. And I can test VSX vs Realphones using my Slate VSX HPs.