I think all of the suggestions are excellent. As an FYI, I used inexpensive threads when I first learned to free-motion quilt. But I've learned that the FMQ just flows better with higher quality threads. Personally, I like Superior threads 40 & 50 wt 100% cottons, Aurifil's 40/50 wt and also YLI's silk. Better quality threads produced better quality results, and don't come with all the hassles that cheap thread come with. Well worth the extra money.
SewCalGal
www.sewcalgal.blogspot.com