Robison Anton cotton is the only thread I use. it is reasonably priced and my professional machine loves it. It is a little linty but I clean my machine after or before each use. It really isn't an issue.
That is a great price!! Get as much as you can.
I havnt ever used rayon. But I woulod like too. Is it used for FMQ quilting? I am a purist and love the thought that my quilts are 100% cotton. But I am thinking about rayon.