I'll step forward and say I don't agree with you there. I believe you're talking about market timing and I can't think of anyone who can do that well and/or for long. A mix of investment styled funds could work and, in fact, that's what Peter Lynch recommends in his book, Beating The Street. He emphasizes that you should put more money into the fund that's been underperforming rather than putting it into the best performing fund.
That, and oftentimes it's easier to find bargains when you're a smaller investor in every kind of market. Most of my current investments are either in small cap stocks or small cap funds.
Just to be clear, we're referring to growth investing as outlined in Common Stocks and Uncommon Profits?
Philip Arthur Fisher - Wikipedia, the free encyclopedia for those who aren't familiar.
Fool.com: Investing, Stock Research, and Personal Finance practices that sorta approach. good site with easily readable information.