I've just started as a grad student this summer, and want to know what I can do to prepare for retirement (hopefully an early one). I've almost maxed out my $5500 contribution to a Vanguard Roth IRA, and my university does not provide a 403b/457b for grad students (I had posted a while back, thinking I could do that but the sad news was broken to me today by the school's business office). I have about $35k in a savings account from my time in industry before going back to school, and it feels like there's something I should be doing with it more than just letting it sit there.
I also have $7200 in a Schwab SIMPLE IRA from my old job (opened October 2012, and I left the job in April 2014). Not sure what to do with this or when -- I'd like to roll it into my Vanguard account but am unsure of how that works.
My current take-home pay as a research assistant is about $1600/month, and I'm saving to the point that I can pocket $200-400/month of that in my savings. I think I've got a good amount as an emergency fund, so is there anything I can do to make good use of the extra?