I was just gonna say this. PS2 came out like yesterday, at least that's what it feels like to me.
Anyway probably Chrono Trigger and Seiken Densetsu 3 on consoles, and the original Baldur's Gate on PC. (we can kinda count the late 90s as somewhat retro now, right?)
Chrono Trigger because I love time travel stories. Seiken Densetsu 3 just blew me away back in the day for having different storylines for the different heroes and overall had an awesome fantasy atmoshpere and great soundtrack by SNES standards. As for Baldur's Gate... hm, pure nostalgia, I'd say.