The greens have to go at the bottom of the list. The secondary jerseys have become mainly devalued over the last generation. Virenque's tactic for the polka dots have rendered mountains jerseys as a break specialist's plaything (the re-allocation of points at the Tour has salvaged it a little in terms of who wins it, with Samu and Quintana being especially notable, but also that re-allocation lends it a rather artificial feeling) while the points jerseys have been killed by two things. One, the enormous sprint-weighting of points in the Tour which narrow the field of contenders enormously (each year Sagan picks it up early in the first week and never looks like losing it), and two, the backloading and HTF/MTF frenzy especially in the Vuelta which render it little more than a consolation prize for the GC guys.
Monuments and the Worlds have to go above the GT podium for this simple reason:
Quick: who was 3rd in the 1999 Vuelta? Who won the 1999 World Championships?
Who won Liège-Bastogne-Liège in 2008? Who was 3rd in the Giro that year?
I bet you most people could name Freire and Valverde quicker than Heras and Bruseghin.
12 GT stages, if they're all pan-flat sprint stages it's impressive, but sprinters get more chances than most to win, and there's usually five or six of them per GT. Winning 12 GT stages and NOT being a sprinter is another story. Gino Bartali and Mario Cipollini have the same number of Tour stage wins (12), for example. Are Cav's 43 or Petacchi's 48 GT stage wins, all sprints of some kind, varying terrain, really that more impressive than Bernard Hinault's 41 spread between sprints, breaks, punchy stages, mountain stages and time trials? Daniele Bennati and Federico Bahamontes have the same number of GT stage wins, I can't possibly imagine Bennati will still be being talked about in 50 years' time.