Can anyone here justify if the extra $100 for the 9887 is worth it? I've read that it has a parametric EQ and another module you can buy for it ($250) so you can tailor the sound to your particular car, but that's a total of $350 that I can spend elsewhere. I'll be adding a 4 channel amp as well as a Punch 75 running 2 10s under the rear seat. Right now I'm running the factory audiophile head unit and Alpine 6x8s. BTW-it's going in an 05 King Ranch Super Crew. Any opinions are greatly appreciated. Thanks.