I have the usual amount of rulers and even some special ones that were needed for specific quilts. They kind of all come in handy if you know how to use them. I've been doing some improvisational piecing lately and it's so fun not to measure anything with rulers. Just sew! I do square up at the end. My favorite small square up ruler is the Easy Square, Jr. It's $4.99 at Jo-Anns. Three bucks if you have a coupon. It's super for half square triangles.