For my two cents I would avoid a managed plan if you have even a minimal amount of self discipline. Invest in about 75% SPY and 25% in some sort of a low fee, high quality corporate bond fund, and then don't touch it for 5 years. Every 5 years, sell 5% of you SPY and move to bonds. By the time you get close to retirement, your holdings should have basically flipped and reversed.
If you feel adventurous and have other retirement money, take 5 or 10% of your money out of the SPY and use that to chase your hot stock tips and whims.
Realistically by using the top formula you are going to outperform overall fund returns on a really long term basis, but still have some safety built in.
If you don't feel like you can follow a plan like this and don't want to risk it, move into a managed plan. But it will cost you 2 to 3% of your money annually to do it.