iD L all the way!
I have the original iD L, and I played with it for a good 10 months before taking a temporary hiatus. I think I'll start it up after school is over.
It has 32 characters so you'll never "get one" too much, and it has unlockable destinations to keep you interested.
You can plant seeds, which is one of my favorite features. You never know what'll come up, whether it's one of (two or) three options, or maybe it will die. It's always a surprise. ^_^
My favorite feature has to be the ability to get even more features...
DOWNLOADS have to be the best part. You can get everything from more clothes to more restaurant options, more wallpapers and different seeds, plus some of the Henshin-Jo characters need downloads to turn into their alter-egos.
Unlike the black and white Tamas, you can dress up your characters! It's priceless to see them walking around in little outfits that you put them in.
Also unlike the black and white Tamas, you can see the color Tamas in the dark, which is a fantastic bonus.
Now, if you're interested in an iD L, take into consideration the 3 different kinds: The original (which I personally love), the 15th Anniversary Ver. (Very good collector's version), and the Princess Spacy Ver. which isn't that different than the original; Everything is the same, except with three different adults, different games, and a whole lot of pink!
If you have any questions, feel free to ask.