Which calibrator for the Dell U2713HM?
I recommend the Spyder4Pro or Spyder4Elite, not the Express. The Pro and Elite have an advanced mode which will give you graphical guides that help you manually adjust the monitor's brightness, contrast, and individual R, G, & B values. Doing this will give you the highest quality and longest lasting color calibration.
Living and loving it in Bangkok, Thailand. Canon 7D - See the gear list for the rest.