Aurifil? I will only purchase Aurifil 50wt 2-ply now for piecing (although Prescencia 60wt 3-ply sounds good also). Aurifil is a much smoother, finer thread than the cotton thread from Connecting Threads. The CT thread is linty in comparison to Aurifil.
Fabric.com can be a good place online to purchase Aurifil when they have the colors you want on sale. They offer free shipping on orders of $35 or more.