I got the CE.. if you didn't know this, the 5 bonus cars you get in GT mode when you first start. So you can skip the used car lot to buy a random P.O.S. and go with a Lambo on day 1. That is always nice
The APEX Book is awesome too... I learned so much about driving techniques that I never knew before, as well as things on tuning. I have consulted it a few times already when playing with my car's tuning.