If I were you, I would go with the enanthate. The problem with the propionate is that the injections are very painful, and you will need to do many more injections over the cycle. Besides, it is hard to keep stable levels of the active substance in the blood with such a short ester. With the enanthate, on the other hand, it is easier to keep the levels of test even, and you will need considerably less injections, which will not be painful.
With the aromasin and Cardarine you will get a hella goot stack:
Weeks 1-12
Testosterone enanthate - 500 mgs per week (split in two weekly injections of 250 mgs)
Cardarine GW-501516 - 12,5 mgs ED
Aromasin - 10 mgs EOD.
Then wait two weeks, and run the PCT with nolvadex, clomid, Ostarine MK-2866 and some good natty test booster.