I have an 820, which is like yours except I don't have embroidery. My machine doesn't like invisible thread or metallic or Dual Duty. It's probably me not being able to figure out the adjustments though. I use mostly any Superior thread on the cones - no specific ones. Mostly I like polyester for piecing. My machine seems to like the Superior ones the best. I use Aurifill too. Have fun with your new machine!