I would maybe substitute the prop with some aratest @ 500mgs a week, and add in the d-bols. However if your worried about looking bloated then maybe not use the dbols.
Yeh Add the Dbol.. start out light.. 30mg a day for weeks 1-6.
I wouldn't always take the cheap way out! That's not the best case.. spend the extra few bucks on some stuff that will give you better gains. But if it's what you have, don't waste it.. you'll do just fine.
Just remember.. eat properly.. SLEEP! and train ur ass off
About the prop - there's absolutely nothing wrong with it. As weam said it's safe and effective, but the shots are supposed to be some of the most painful and you've got to shoot it more often. I say go for it. What brand is the 150mg/ml prop (just 'cause I've never seen it in that concentration)????