First off, why do you want the different barrel?
What do you use your AR for?
Do you have to or plan to carry it a lot?
What type of ammo do you want to feed it?
What type of area do you live in with regard to humidity? And where do you plan to take it to use it?
These questions can help in making a recommendation in profile, length, rifling twist, barrel material, and whether or not to recommend a chrome lined barrel or not.
Not sure where you are looking at a barrel for $150 but there are some companies that you may want to avoid.