Edyta recommends using Aurifil thread and sells it on her web site:
http://www.laundrybasketquilts.com/Shop/shopindex.htm
It is a 50-weight cotton thread, which means that it is very thin, and excellent for piecing because it does not create extra bulk in the seam allowance.
I like Superior's MasterPiece thread. It is also a 50-weight cotton thread, but this thread is made with extra-long staple Egyptian-grown cotton, and produces very little lint.
I find that Aurifil tends to produce more lint than I want to deal with.
A lot of TQS members are now using mostly Superior Threads. They have been a site sponsor since the beginning of TQS. In fact,
Dr. Bob, The Thread Guy, was on the very first TQS episode, and continues to offer thread education through his excellent web site and monthly newsletter.
I, for one, really appreciate learning WHY some thread types work better in some situations than others do, and like having a resource to help me troubleshoot any problems I'm having with tension or breakage when sewing on either my domestic and/or my long-arm machine.
http://www.superiorthreads.com/education/
And their customer service is top-notch!
I agree. Superior Threads dominates my thread stash. MasterPiece is what I'm using as well. Their website is worth a look around. There is a lot of solid info there. If you even get a chance to hear Bob speak at a quilt show it is worth it. Their booths are usually filled with friendly staff and Mother Superior is especially kind. High recommendations from me on this company.