Harvest Moon is amazing! I first got More Friends of Mineral Town when I was 16, and have been hooked since. I love building relationships with the villagers, and harvesting pineapples, and horse races. And the love cutscenes are so beautiful. When I played FOMT, I'd always marry Elli; with MFOMT, I'd alternate between Rick (I admire someone who looks after their parent), Cliff (a sad but charming person) and Doctor (he could be charming).
I tried playing the PlayStation version, but didn't really get on with it.
I played DS Cute, that was quite fun, plus Skye was a great character to have as my character's love interest. I liked the backstories of the characters too, especially Lumina. One of the things I really liked about this game was that you could have a 'Relationship ring' as an accessory: put the ring on, and you could tell how others felt about you in terms of friendship and love. I really wish that one of those existed in real life, it would make things a lot easier.