I would just follow the Vanguard Target Retirement allocation so:
0-10% in bonds VBTIX, but I'd go 0% for now
30-40% of the stock in international so 30% in VFWSX
The rest in US stock but you only have VIIIX which is the largest 500 companies, and VIEIX which is everything except the largest 500, so you could do them in a ratio of 2:1
46% VIIIX
24% VIEIX