I made a simple excel sheet to show you DoT improvement by getting more DA or Haste on your gear setup.
You just enter you current Haste and DA as base, and then your alternative setups as new and it will show you % increase in swings.
http://www.megaupload.com/?d=RAZ4VL6B
http://www.easy-share.com/1914383805/GaiaSwingCalc_v11.xls
Any feedback is welcome here