I use Coats&Clark and have for years. I know some people don't like this brand, but it works for me. I also use Mettler and Gutermann. I have heard good things about Aurifil and the thread from Connecting Threads, which is priced very nicely. Some people also use Poly thread with good results. I think the most important thing is if your machine with like it. Some machines are picky and work better with certain threads. Good luck,Gina
And yes to what Tartan said!