 If you liked
Trigun
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 ...then you might like
Great Teacher Onizuka
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Although the settings are completely different I feel that Trigun and GTO feel very much the same. Both main characters can get themselves out of any situation!
It's a bit of a stretch but hang with me.
Both main characters have personalities that are (really) similar to each other and are easily likable.
Both are mainly focused on helping people through their situations (Trigun only does this early in the series)
Both have unforgettable theme songs (more so in Trigun than in GTO).
Both are considered classic anime series.
Both have excellent soundtracks.