At your size, 250 won't cut it. You also have to figure for AS dosing is kindof mg/kg bodyweight. give a pekingese dog 250 mg sustanon and give a cattle the same amount, see which grows faster as a function of its original weight.
Use 500 mg like nautica said. use enanthate or cypionate, not sustanon unless you run 750 mg week to take care of the longer esters. I dont like the decanoate ester anyhow ... takes a long time to get out of your body.
Id go as far to say, do this cycle..you wont regret it!
Week 1-10: 500 mg testoviron (enanthate)
Week 1-6: 30 mg dbols ED
NFG