A friend of mine is selling me either STREET 50's In ear headphones by 50 cent or Ultimate Ear 600's (non vi) Both are priced at 50$. I've read reviews about the Street 50's being good durability however the sound quality itself is average. It uses a 11mm Dynamic driver (Not 100% Sure what that means)    I've also read that the UE 600's are single balanced armature and the sound quality is above average however I'm not exactly too sure about the build quality. To...