I use Essentials neutral colors thread for piecing . I use thin bobbin thread in the bobbin. When I do my own machine quilting I use YLI silk thread on the mini cones. The silk thread makes my quilting look fantastic. I use wool batting with the silk thread. This is for the nicer quilts, not for the kids quilts or fun quilts.
I found a new thread called Glide that I really like for machine quilting. It's reasonable in price and lots of great colors.