The way I do it: So long as your more then 5 years away, I do index funds. The index fund cost to run is one of the lowest for management. Once inside the 5 year window for use, need to move to more bonds and Government securities.
Tried an experiment about 5 years ago, moved half funds from Vanguard Index to Vanguard Wellesley fund. The Wellesley is 65% bonds rest index. To date the index has out performed the Wellesley but not by a huge amount, about 1 percent, but the load on the Wellesley is a bit higher