I love that series. Bighead Baseball for the win. They crank out almost two of those a year over in Japan though.
I like how they assign different players attributes which helps you easily figure out what each player is good at. They'll tell you if someone is great at squeeze plays or little things like that.
The only problem I had in the past with the GBA titles was how you couldn't really suspend a game in progress, although that's not a problem anymore with the DS. Maybe I should get the DS version.