I am placing an order and need to know...which thread is best for quilting on a regular machine...100% cotton or 100% polyester or 50/50 blend? I was using C&C Dual Duty, but heard poly wasn't good for quilting. I am now using 100% cotton, but it seems to not like my machine as I am constantly having to adjust for tension issues. And I heard polyester breaks down after while in the quilt. So what is a good medium? I can't afford to buy one of each kind and try them, and I don't know any specific brands..so what is good? I am going to buy them online as they are cheaper that way, and need to buy several to make my order for free shipping, but also to have what I need in color variety.