I'd recommend the VA VEST plan as well. It has very low fees, lots of food investment choices, and you can deduct any contributions from your VA state income taxes. Just because you are going to move in a few years, doesn't mean that you shouldn't take advantage of the VA tax deduction now. As stated above, you can use the money for any school, not just schools in VA.
As for what to invest in, personally I would just split my investments between Vanguard Total Stock Market, Vanguard Total International Stock Market, and Vanguard Total Bond Market.