I currently have a tIRA, a 401K, and my taxable brokerage account.
My tIRA is in AMANX and AMAGX (I believe I need to sell these and reallocate my funds, as their expense rations are over 1.20% and don't provide good diversity between the two of them).
My 401K is split between a large cap growth, an international growth, and a bond fund. Not many good choices, so I made the most of what I had available.
My brokerage account is in QQQ and SDY at the moment.