I buy 2yards. Most times that is enough for me to design with. That being said I also buy for projects. I also buy because I have to have it! Usually 2 to 3 yards. But as ckcowl said buy for the way you quilt. If you think you may begin quilting larger quilts buy 2 to 3 yard pieces. If you want to increase your stash buy 1/2 to 1 yard pieces. Buy blenders that will work with 2 or more focal fabrics. Have fun! Luann