I have a few rulers and the ones that I use the most are my 6.5 square my 6.5x24 and my 2.5x6.5 I have a 12.5" square and a 8.5" square and a 6.5x18" also but dont use them quite as much as the others. I would get a diamond ruler maybe and would either get an olfa or one that I saw from martelli's. saw it at a quilt show. those two would be the ones that i would get. have a fiskers now and it works for the price i was willing to pay. looking at getting a larger one soon.