Gretag Macbeth which is now owned by X-rite is pretty much industry standard. They have come out with a new item called the Colormunki targeted at the photographer. Pantone make a very affordable calibrator called the Huey. I have my laptop and workstation calibrated to our workflow it helps with consistency but its no silver bullet. You can get pretty close with the controls on the computer if you are working to match the output of you own printer. You might want to consider your viewing conditions also, if you work in an area where the color temperature changes a lot its a real problem. Your color settings in PS can be confusing as hell too.