When I purchased my janome horizon they told me not to use coats and clarks thread. Of course I have tons of it, but am afraid to use it in my machine. So now I'm trying to collect a variety of "good quality" threads and am horrified by the price, and I'm confused about the different types .... polyester, cotton, etc. I'm looking for a good reasonably priced thread that is suitable for piecing, quilting and general sewing?