Interesting how times, and boats, change. All 3 of these boats were very good boats in their day. The Siren was a woman's boat but I remember watching Dan Gavere throw down in one. The Jive was really a good playboat. Great wave surfer with good hull speed and a really slippery hull. A good river runner that was perfect for the big green waves of the Kennebec Gorge in Maine where I saw it paddled a lot. Definitely the next generation with a planing hull after the displacement hull RPM.
A little history... The Shock was designed by Shane Bennedict when he was with Perception in the heyday of new boat designs at the turn of the century. Its no modern looper but ends and Blunts in it were sweet. Its the smaller version of the AMP and came out just before the Worlds of 2001 in Sort, Spain. Shane had been coaching/teaching at Adventure Quest and the entire? US junior Worlds team had trained with him. Pat Keller, Jesse Murphy, Marlow Long and BV's Dustin Urban all paddled for Perception and competed in the Shock. The Tricky Whu was one of the new moves and the US Juniors had it more dialed than most all of the Men competing. Marlow, Jesse and Dustin made Finals with Jesse winning and Dustin taking the Silver. Bryan Kirk now of WS paddled the AMP to a Bronze medal at his first Worlds. I believe Barry Kennon and Chris Manderson both C-1ed the AMP with Barry winning the Gold and Mando medaling but I can't remember where he stood on the podium. Few have ever C-1ed at the level those guys were. The boat hardly sucked.
Of the latest list, I agree that the G-Force is your best choice.