I am creating a Williams system 11 list and info thread for reference. Please feel free to add any applicable factual information.

Bad cats - Nov. 1989. 11B
Banzai Run - May 1988. 11B
Big guns - Oct. 1987. 11A
Black Knight 2000 - April 1989. 11B
Bugs Bunny Birthday Ball - Jan. 1991. 11C (the last system 11 game made)
Cyclone - Feb. 1988. 11B
Diner - Sept. 1990. 11C
Dr. Dude - Nov. 1990.11C
Earthshaker - Feb. 1989. 11B
Elvira and the Party Monsters - Oct. 1989. 11B
F -14 tomcat - March 1987. 11A
Fire! - August 1987. 11A
Gameshow - April 1990. 11C
Grand Lizard - April 1986. System 11
High Speed - Jan 1986. System 11 (the first system 11 game made and the highest production run at 17080)
Jokerz - Dec. 1988. 11B
Millionaire - Jan. 1987. 11A
Mousin around - Dec. 1989. 11B
Pin*Bot - Oct. 1986. 11A
Police Force - August 1989. 11B
Pool sharks - June 1990. 11C
Radical! - Sept. 1990. 11C (lowest production run at 1315)
Riverboat Gambler - Nov. 1990.11C
Road Kings - July 1986. System 11
Rollergames - June 1990. 11C
Space Station - Dec. 1987. 11B
Swords of fury - June 1988. 11B
Taxi - August 1988. 11B
Transporter - April 1989. 11B
Whirlwind - Jan. 1990. 11B

High Speed - Jan 1986. System 11
Grand Lizard - April 1986. System 11
Road Kings - July 1986. System 11
Pin*Bot - Oct. 1986. 11A
Millionaire - Jan. 1987. 11A
F -14 tomcat - March 1987. 11A
Fire! - August 1987. 11A
Big guns - Oct. 1987. 11A
Space Station - Dec. 1987. 11B
Cyclone - Feb. 1988. 11B
Banzai Run - May 1988. 11B
Swords of fury - June 1988. 11B
Taxi - August 1988. 11B
Jokerz - Dec. 1988. 11B
Earthshaker - Feb. 1989. 11B
Black Knight 2000 - April 1989. 11B
Transporter - April 1989. 11B
Police Force - August 1989. 11B
Elvira and the Party Monsters - Oct. 1989. 11B
Bad cats - Nov. 1989. 11B
Mousin around - Dec. 1989. 11B
Whirlwind - Jan. 1990. 11B
Gameshow - April 1990. 11C
Pool sharks - June 1990. 11C
Rollergames - June 1990. 11C
Diner - Sept. 1990. 11C
Radical! - Sept. 1990. 11C
Dr. Dude - Nov. 1990. 11C
Riverboat Gambler - Nov. 1990.11C
Bugs Bunny Birthday Ball - Jan. 1991. 11C

As of this posting date (2/23/2019), there are 10 system 11 pinballs in the pinside top 100

Whirlwind (#39), Elvira and the Party Monsters (#54), Taxi (#65), Black Knight 2000 (#76), Earthshaker (#88), Diner (#91), Pinbot (#94), Swords of Fury (#97), Banzai Run (#98), and High Speed (#99).

I addition, there are quite a few "spinoffs" and sequels to system 11 games represented in the top 100.

Banzai Run rates as the most expensive (according to the pinside market).
Millionaire rates as the least expensive...and also has the second lowest rating (#350) ...not too far behind Pool Sharks (#318), but just ahead of Bugs Bunnys birthday ball (#363).

System 11 boards were also the front runner for later WPC boards, and later S11 models really resemble them in many ways.