AAP,
Since it's gonna be your first time with deca I would suggest Durabolin instead (it's fast acting deca, nandrolone phenylpropinate) as it will leave the system if you have gyno symptoms. If you are gonna stay <=400mg/week than just go with plain old deca as it is cheaper, but I wouldn't risk 600mg for a first timer.
On that note, highest I went on deca was 400 mg for 2-3 weeks in my first cycle.
-sk