The original for super nintendo, the one on PS1 that I can't actually remember the name of... Hmmm... The Rune Factory games aren't too bad if you're looking for a "Harvest Moon+" experience. Those are the only ones I've played hardcore. Avoid "A wonderful life" on the gamecube at all costs.
I loved Harvest Moon for snes, beat that when I was 14 "Holy shit 10 years, fucking a I'm old", I own Harvest Moon 64 beaten that one when I was 15.. "Fucking damnit 9 years, fucking old" I went and got friends of mineral town, but I might borrow a couple of harvest moon games from my friend who is a big HM nutcase like I ams, just that she has more money then I do and actually cold afford them at the time of the release.