There are so many it would be hard to choose. Look at what's available and decide which shapes you cut the most. I use the 2 1/2" strip cutter, most of the square and half square dies, tumbler block, hex, circle, and lots of whole block dies like DWR, Rose of Sharon, baskets, Sunbonnet Sue, Alphabet, etc. I usually buy the try me dies as they may not be available in stores and not many are made.