If yu're looking into the older ames, I suggest Friends of Mineral Town for GBA. It's basically Back to Nature for the ps2, but ported to the GBA. It's available on Virtual Console for Wii U if you prefer to play on a larger screen. As for newer games, I HIGHLY recommend A New Beginning. If you like the idea of helping rebuild a town, this is the one for you! I also LOVE the idea of customizing you character as you want. The only thing is, you have to build the hair salon in order to change your hairstyle/color after character creation. I also suggest you play Tale of Two Towns. It's tough to decide on what town you want to live in, at least it is for me, but both towns are unique in their own way. If you want to get the 3DS version, I suggest you get it on the eShop rather than buying a physical copy. I've heard that the digital version fixes the freezing issue people have with the physical, or just buy the DS version. You can get it used for a steal depending on where you buy from.
I also suggest you try Story of Seasons. It's basically Harvest Moon, but with a different title and publisher. Natsume, the former publisher, owns the title Harvest Moon, and they decided to make their own HM(That is not a part of the main series) called the Lost Valley, so Marvelous had to search for a new publisher, XSeed Games, to make the next game in the official Harvest Moon timeline. You can find videos that explain this whole ordeal better than I do, so look into them if you want a better explanation. I just kept it short and to the point, so you should have an idea as of what happened, but there are articles and videos discussing this that get into more detail. If that's what you prefer, I suggest you look into that.