Tribulus doesn't work man. and 400-500 is a normal level. Even at 250, you'd have problems finding a doctor willing to prescribe TRT due to many not knowing much about TRT protocols.
And by the way, the doctor doesn't just hand you a bottle of Test C and tell you to go pin away. They're most likely going to start you off on that androgel.
http://www.ncbi.nlm.nih.gov/pubmed/17530942
I get a weekly injection at a TRT clinic of test C. and I blast with other test (and steroids in addition to my trt dose).