I've really enjoyed the Westalee starter set. It has 6 rulers, and only costs $65. I like it so much, I got a set for my longarm, too. My 2 favorites in the set, which you can buy separately, are the "Circles on Quilts Spinning Wheel 36 #COQSPW36 and "Spine-E-Fex No. 4 - 3 1/2."
Do you find that you need a straight edge ruler as well as the starter? Also, do the Westalee rulers have any anti-slip on the back?