That's really a personal preference. Many incandescent lights have a warmer color temperature, 2700K or even lower than that. If you like the warm/soft white light from an incandescent, aim for 2700. But if you want something a little cooler or more neutral, look to the higher temperature. Here's a graphic that shows the difference as you move up the Kelvin scale: http://www.lightsonline.com/resources/lightsonline/images/uploads/ColorTemperature.jpg

I hope this helps! Let me know if you need more advice.