test is probably the best mass buider by itself when everything is taken into consideration (including side effects) ...
tren might be one of the most powerful steroids ever created but you are right it can be very harsh - especially in higher dosages ...
if you want to keep gains, id go with something that builds lean muscle over time - not all out mass - all out mass compounds often involve water retention and a rapid increase in weight... most people think mass is lean muscle, they couldnt be further from the truth ... for the future considering your goals, age and needs id leave deca out if you want to go for more maintainable gains ...
remember lean muscle is difficult to gain, but difficult to lose ... gains yielded over time enable your body to adjust to them ... large increases in weight\/mass severely strain your body - ESPECIALLY the heart ... and make it difficult to hold on to this mass when you finish your cycle ...
Mild Steroids such as the following can be added to Testosterone ...
winstrol, equipoise, turinobol, anavar, masteron and primobolan
these drugs are relatively mild when it comes to side effects, of course side-effects are also dose dependant - these steroids also enable you to maintain your gains after the cycle a lot easier ... always use testosterone with a cycle - even if people tell you otherwise -