Ox is right, Dbol on your first cycle is fine. I've seen and heard many more experienced people acknowledge that.
As far as Masteron......sure the leaner you are, the better it will work, but i've also seen it work marvles on people who's BF% was in mid-high teens. It almost enhances the other compunds being stacked with it....BUT, i wouldn't recomend it with the first cycle.
OP, I would stick with the Test and Dbol IMO. First cycle will almost always yeild you th ebest result, so why not do it right.
Dammit man that is dead on....I even like the mast advice...you nailed it. Would rep you but I apparently rep you to much as it is