A Roth IRA, maxed every year, is my main form of "real" investment. I try to put about 75% into index funds and 25% into handpicked stocks, which are my concession to desire to gamble. I don't buy bonds or CDs -- I'm young enough that short-term loss is a non-event, since nothing short of "my children are starving on the street" will induce me to touch the Roth ahead of schedule. Wild volatility doesn't matter becaus…
I am still relatively young so my risk profile is more on the risk seeking side right now. I'll seek out more of the funds when I'm 35+, married with children, and have more to lose.