Well I can think of some rides that every park outside of the Disney or Universal chain needs!
. A kiddie coaster
. A family coaster for the the "In between" crowd that's under 48" tall
. A Gerstlauer or Maure Shone spinning coaster ( )
. A Ferris Wheel (non kiddie)
. A Scrambler
. A drop tower
Ride Viper at SFMM!
Would you rather have Darien Lake reopen 'Cuda Falls or have Darien Lake remove 'Cuda Falls (and Floodgate Fall!) for a Gerstlauer spinning coaster?