Congrats on the success, you just got there a couple years before I did. Don't be afraid of the deferred comp plan, it acts very similar. I have one that my contributions go into after I maxed out a 401k.
I would say keep this as simple as possible - Open a regular brokerage account with Vanguard or Fidelity and send the excess each month into an index fund. I prefer Fidelity because I can walk into an office if I have a real issue to deal with, which has only happened twice in 10 years, but personal preference.
Once you get $100,000 saved up in that account plus paid off your loans, then worry about the more advanced advice. Having $100,000 in a regular, accessible account is an incredible F-off fund. I missed a couple investment opportunities in my late 20s because all my money was tied up in tax deferred accounts. Remember, savings habits are 80-90% of the game, then comes the tax and fee optimization. You're already there on fee optimization if you go with a Fidelity or Vanguard Index fund and they don't throw off a big tax liability if you don't sell them.