As mentioned above, you may want to "insure" with an 20 percent allocation to bonds or maybe 10 percent in gold. If there was a crash in stocks and people were fleeing then you should be able to sell your "insurance" at a premium and scoop up the cheap stocks. Of course the downside is that your stock growth is affected but for the peace of mind it may be worth it. Otherwise just go all stocks (cheap index tracking fund) as is the general consensus around here - you could do much worse.