There are a lot of questions regarding types of thread, recommended needle size and recommended tension out there. We have taken a lot of those questions and now have a guide called the Home Machine Thread Reference Guide. http://www.superiorthreads.com/media/uploads/2011/08/09/files/Reference_Guide_-_HOME_7-11.pdf
This is a great reference guide. In fact, I've taken mine and laminated it and have put in the drawer next to my sewing machine. (It's laminated so the melted chocolate won't get on it while I'm sewing.....yes it can be done!). This guide lists all of our threads along with the recommended use, bobbin thread, needle and top tension setting.
So, click on the the link above and print it out. (You might want to laminate yours too!)