Well from what I've gather from the steroid profiles, correct me if I'm wrong, is that Deca and Masteron stacked will give you one hell of a cycle, of course with a Test as well. The Deca will obviously help you blow up but the Masteron will help keep some of the water retention under control and let you keep that lean and ripped look. Masteron is generally suggested for people less than 10% body fat because it's not used so much for building muscle but instead making the muscle you have look shredded.
So in conclusion the Deca/Test gives you your gains, the Masteron makes it all look beautiful as long as you have less than 10% body fat.
Biggest downside of Masteron is the price though, it's pretty expensive stuff - comparatively.
Deca
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http://forums.steroid.com/showthread...lone-Decanoate)
Masteron
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http://forums.steroid.com/showthread...one-Propionate)