We also did the Critter books, Berenstain Bears (level 1 books), Amelia Bedelia also comes in Level 1.
Our daughter loved the Digby and Kate books.
Now we have moved on to the Pet Fairy books, Magic Tree House and My Weird School. Although she can blow through those books in less than an hour, she still loves to read them...I just can't keep up with the trips to the library/book store.
Do what you can, with what you have, where you are.