Somewhat a newbie, with some stacking questions

I am on my third cycle. It is a fairly hefty 700mg Testosterone Propionate/week. I am fairly pleased but could be happier..I workout like crazy!! Getting fair results, but looking for better... Would I benefit by stacking it with something else? What steroid does everyone recommend? What are the benifits of stacking? Should I reduce Test Prop dose if I do stack? Lots of questions..:shrug:

Thanks in advance for any and all advise!!!:shrug:
-Depfife

Stats,
Goals.

38 y.o. 6'2" 193 lbs. I am eating VERY well !! My goals are just to get stronger and bigger... Not a LOT bigger,,, My biceps are only 15"... would LOVE for 16"... I don't need to be huge like so many of you guys are..

Thanks for any and ALL help!!!