congratulations. The best thing is just try out the threads and see what you like. I don't know what kind of machine you have but some brands of machines like certain threads better and others are just happy to have some kind of thread in them. Of the brands you listed. I like the mettler thread. but there are different kinds. I generally use Mettler silk finish cotton thread weight 50 for piecing. I also have used the gutterman 100% cotton but find that a little bit more linty. Both of these brands make polyester thread too that works fine for piecing. But what I would do, is go to the websites for each brand of thread and look for some kind of a thread information sheet as most will describe each of the threads they make and the usage for that thread. I generally do not use the coats and clark or dual duty for piecing as those threads tend to be thicker and the piecing does not lay as flat when you press it I do use what dual duty I have left if I need a certain color for binding and don't have it in one of my other threads. Sulky also makes a lot of different threads. I haven't particularly cared for it for piecing as the stuff I had did not seem as strong as the other ones. But the sulky I had did have a beautiful sheen to it and looked lovely for decretive stitching in stuff that did not need to be strong.