First post nails it. I would recommend Rune Factory 3 also for your HM fix. I also played the first one and i did like that one if you like dating boys you should go for the cute version. I played the sunshine island or something and i didn't like that one. don't know about the rest i would like to play them but i have never seen them in store to buy. Is tales of 2 towns any good? Saw it for the 3ds but it is still kinda pricy
I can tell you which one NOT to buy, Island of Happiness. Worst Harvest Moon game I've ever played and I haven't had the desire to buy one since. Constantly running around trying to cross off all the tasks on your list (give this girl a flower, water these crops, feed the cattle) in an extremely short time limit each day is not my idea of HM fun.
It's just little things that ruin the rest of the DS games for me.
HM DS when patched is the closest thing to HM FoMT and DS Cute is the closest thing to More FoMT, though it does have an added layer of complexity. The rest of the games all mess something up; controls for the first island game, interaction in ToTT and GB, crops in the second island game.
The second island game is the best, then Grand Bazaar, then the first island game, then tales of two towns.