Back in the good old days before we met, my wife, self-employed, opened a Keogh account with Fidelity. She's accumulated about $112K over the years. She's still self-employed, as am I, but in a much less lucrative field. I've recently converted her to Fooldom (it was easy -- I just locked her in the bedroom with The Unemotional Investor) and we have the following dilemma. We'd like to use the money now invested with Fidelity, in mutual funds, to invest in a more Foolish manner (we're thinking specifically about the Foolish Four.) Is it possible to do so while keeping the money in a Keogh account, or is converting to another savings vehicle -- SEP or IRA Roth, for example -- necessary?

We're babes in the woods when it comes to this stuff, so any and all information will be much appreciated.