I'm one of those quilters who loves rulers. I'm sure I have way too many. The one ruler that I use on a daily basis is Kimberly Einmo's EZ Jelly Roll Ruler. It is 5" x 10". It is great for pre cuts. I use my 6" x 24" ruler pretty often. I have 3 June Taylor rulers: Shape Cut Plus, Exact Eights, and Shape Cut Pro. I love those June Taylor rulers! They are such time savers! I also like rulers for squaring. I know you can get one square and use it for all sizes; but I like the exact size from 2 1/2" to 15 1/2". Of those, I use the 12 1/2" most.