Let me first say, there is no best barrel for a particular marker, as long as you get a autococker threaded barrel any barrel will do fine. The difference is mostly efficiency and sound signature. Most people want the quietest and most efficient barrrel.
This is why i have to recommend the new Lurker v3 barrel along with the Disruptive death touch. They have long backs (Wich increase efficiency) and have alot of porting wich makes them quiet. The lurker is the cheapest and have the most amount of porting of any barrel today, wich should make it the quietest.
I can also recommend the furious lotus barrel, despite it having a short back, it is a very good barrel wich is fairly quiet. Is the most expensive of the three.
Dye UL barrels is pretty expensive and offer no more features then any other barrel, besides look maybe and beeing DYE.
I do have the Disruptive barrel and it is indeed the quietest barrel ive had so far (yet to try the new lurker wich should be deadly quiet.)
Macdev Clone VX Brown/white
Safer 73/45 with Ninja SLP.