The first three seasons of Digimon Digital Monsters, Pokemon Red & Blue Version (never really cared for the anime after the first season), Monster Rancher (Yeah, I was kind of caught in that whole pocket monster fad back in the late 90's), Crazy Bones, Bionicle (you could make such cool shit with that stuff). The traditional brick Lego sets were there for the entire time. The 90's era Nickelodeon (Orange blob era of cartoons), and the '99-'03 era of Toonami back when it was good (Hell, why not the entire CN lineup prior to 2005?).
Of course, what I miss the most was going outside and doing shit with friends. After middle school everyone just got so god damned preoccupied with their facebook and social networking shit that no one ever wanted to go and have fun outside in the sun as we used to in the 90s. Heck, I love video games as much as the next person on the escapist, but I guess the novelty of them at the time kept us all inside too much. Ironically - now due to work and school & stuff I never get to be outside anyways. I always regret wasted time, even for years afterward.
Oh yeah, GO GO POWER RANGERS! Na na naaa na naaaa! MIGHTY MORPHIN' POWER RANGERS!
And I don't even watch TV anymore.