In fact my 1st has absolutely NOTHING to do with Steins;Gate (except for time travel), but, don't know, it just had a gigantic impact on me back in the day : thats Reborn xD (hence the Gokudera), which just has awesome ost (aww love Steins;Gate's equally, I was just chocked by Suzuha's farewell theme and moment), awesome characters, awesome everything, just as you say.
I'm not that much into shonen, though, my 3rd is Kaiji xD