Supes and Bats go back too far for me to have a specific memory.
Wally I first saw on Justice League. I found his personality annoying and I felt he was redundant, since Superman was one of my favorites and one of the things I loved fantasizing about most was his speed. Then I saw the diverse use of his powers and started to appreciate how he was the happy, more normal one. Once I picked up a Geoff Johns issue of Wally where he describes feeling pain travel up his nerves from a Gorilla Grodd bite, and has a pep talk with another favorite in Nightwing, I was completel engrossed, and the rest was history.