The first is one that many American readers may not be familiar with, but the should definitely check out: Asterix and Obelix!
2. Walt Disney Comics Digest
3: Casper the Friendly Ghost (and most Harvey Comics in general)
4: Little Lulu (and Tubby)
5: Little Archie adventures
If you read comics as a kid, odds are one or more of these were also in your list of favorites, but I would be interested in hearing if you had a favorite that I didn't mention.