I think it kind of depends on what some of your goals are, how you have your current funds allocated, and then strike a balance with all of that based on your risk tolerance.Not sure what your portfolio looks like, and the Dreyfus S&P 500 has an expense ratio of .2% which is always nice. It's a large blend fund so I think it can work as a core part of your portfolio but I think you're going to need to diversify a bit more. How long before you retire? Is the 401(k) your main investment to date? Do you have an IRA?For your rollover, I'm a Vanguard advocate but I think TIAA-CREF also offers some great choices...T.Rowe Price is not too bad either I don't think. Seems like you're on the right track with Index funds now just need to spread them around a bit.