I personally have 23 mutual funds that are spread
over 4 different fund families. An analysis of all the funds yields approximately the same results: many of the same stocks are in each of the funds resulting in poor diversification. I was forced into this
bizzare arrangement by having to chose options in the 401k, 403b, Roth
IRA, standard IRA, and personal holding accounts. Having just retired I will now be able to move many of these scattered funds into just one or two fund families. Most of my MFS funds will be the first to go (high initial fees, poor performance, investment consulting fees paid to other companies, 12b1 fees, pooly designed quarterly reports).

I would recommend that you stick with the Vangard fund family for now due to the no load or low load funds plus the low maintenance fees. If you want to be invested in stock mutual funds then the Vangard S&P 500 mutual fund will, with the minimum risk, be a good choice.

Get on the internet and find performance reviews regarding all
S&P 500 funds that are available. You will find that these funds
will outperform most managed funds. How some S&P funds have the
guts to charge high maintenance fees for this type of fund is beyond comprehension.

You will see that not all of these funds treat you equally as far
as far as initial sales charge, 12B1 fees, annual fees.

All that said, you do owe it to yourself to check out the recommendations sent in by other reviewers of your posting who are
on probably on the cutting of edge of investing.
Its your money, try to keep more of it working for you.