I say the more, the better. I can't tell you how many times I've bought a yard of fabric, thinking that would be more than enough, then finally getting around to using it, finding a project and realizing I need 1 1/2 yards! By this time the quilt shop doesn't have the fabric anymore. Some fabrics will call to you...you'll love it so much you HAVE to get it, but then you don't want to use it because you love it so much!