is your IRA your only retirement investments?
I agree with midpack that you are a little light on international equities (which is my opinion as well). FWIW, here is a link to a vanguard thingy
where they talk about THEIR suggestions for international exposure. They suggest anywhere from 20 to 40% international equity exposure, after that, they claim you loose any diversification benefit. Also, the Boglehead Wiki
cites a poll on their forum where their members have non-US equity exposure from 20 to 50%.
It is difficult without the entire picture, but if trying to imitate a lazy portfolio, what you are suggesting should get you in the ballpark.