Test dose for 5'6 165-170 pounder?

I am trying to help a buddy with deciding on what dose he should go with for his first cycle of Test. He hasnt completely decided between Prop or Enan, but I have a feeling he is leaning more towards Enan.

What would you suggest his dose to be per week? I have been doing an average of 400mg/week (I am 185 pounds at 6'0) and have absolutely loved my gains.I say average because I started at a lower dose, changed my mind, and I am now doing 500mg.

I am thinking of suggesting 400mg/week.

Also, he wouldnt be stacking with anything else, just Test by itself.

His stats:
5'6
25
First cycle
165-170 (probably closer to 170)
Pretty lean, around 12%?
Been working out since I knew him in college, so probably around 4 years or so.

I would still do 500mg if I was him