re: 401k rollover to IRA: what should I go with?

If you are looking for breadth of choice and low costs I would choose Vanguard. If the amount of money is significant I would open a IRA mutual fund and link a brokerage account to it at inception. Vanguard is low frills, but the costs are rock bottom, have had accounts there > 20 years. Also have an account at Wells Fargo, 100 free trades per year with a PMA account. From experience with Fidelity in the past, their interface and fixed income capabilities were better, but that may have changed.

Here is a recent article on Vanguard and its retiring CIO:

LINK