Simplicity is key to me, so here's what I'm hearing:
1) Keep an amount in checking/savings I'm comfortable with based on perceived risks (actually quite low, by design). I like RyeWhiskey's 2.5k firgure.
2) Divert all of my Roth into an index fund (Vanguard or something comparable)
3) Start my additional investing into something simple (again, broad index fund) making regular contributions
4) As my assets grow, my needs change (home downpayment), or as I educate myself on other investment opportunities, consider diversifying
These were my intuitions going in, thank you for all who contributed quick, clear, and concise answers. As a first time poster I look forward to more opportunities to participate in this community.