Things to look for before you start training at the school:
Instructor quality (meaning, if his black belt certificate is written in crayon, don't train there)
Price ($100 is too much no matter what)
Class size (10 - 20 is perfect, and less is better then more in this instence)
Instructor quality part 2 (if he's a wanna be drill sergeant, don't train there)
After that, it's largely up to you. Though, if your looking for real world self defense here are something to keep in mind:
Wing Chun was created for the express purpose of being able to beat the snot out of somebody if needed, or seriously injure them, or (if needed) kill them. The weapons taught are valid, though slightly impracticle in most fighting situations. You will be fighting ready in about 6 - 8 months.
Goju Ryu was created to make the practioner ready to defend themselves if and when nessicary, in most situations. Weapons taught are (mostly) impracticle in a fight. You could be fighting ready in about 5 - 7 months.
Notice any simulartys? The real question has to do with body type, natural skills, and what you would like to be able to do. Wing Chun does little ground fighting, and barely more kicking. Goju Ryu however, focuses more on kicking, and at times does teach ground fighting. Since you did Tae Kwon do before, you may want to do Goju Ryu build off earlier skills. Or you may want to go with Wing Chun to develop your hand skills.
Martial Arts are not practicle in a fight. None of them are. Period. Wing Chun isn't, neither is Goju Ryu, Shotokan, Kyokoshin Kai, Tae Kwon Do, Wushu, Eagle Claw, Tang Soo Do, Boxing, Wrestling, White Crane, Red Tiger, Cuong Nhu, Arnis, Militech Fighting Systems, Brazillian Ju Jitsu, MMA, and Realitly Fighting Systems. None of them are. It is all in the application. One person could train in Jeet Kune Do and in a month be able to beat the snot out of some body. Someone else could train in Jeet Kune Do with the same person, in all the same ways and never be able to beat anybody. It all has to do with the application of the material.
good luck and good training