The worst time to sell is on a dip. It's the best time to buy. Sensible to allow prices to stabilise though. Don't catch the falling knife as they say.

Max Keiser and Stacy Herbert comment on it here -> http://ia700707.us.archive.org/28/items/MaxKeiserRadio-TheTruthAboutMarkets-24September2011/TaM-240911.mp3