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Retirement & asset allocation of $30K for 30 year old single guy
I would definitely recommend putting some of this in an IRA. You can't put all $30K in an IRA immediately though, as the contribution limit is $5500/year for 2014, but until April 15 you can still contribute $5500 for 2013 as well. At your income level I would absolutely recommend a Roth IRA, as your income will very likely be higher in retirement, given that your income will almost certainly rise after you get your Ph.D. Your suggested asset allocation (70% stocks, 30% bonds) sounds appropriate; if anything you might want to go even higher on stocks assuming you won't mind seeing the value drop significantly. If you don't want to put a lot of energy into investment choices, I suggest a target retirement date fund. As far as I am aware, Vanguard offers the lowest expenses for these types of funds, e.g. this 2050 fund.