I think there are only certain situations where the eye colour actually matters, and even then, it's more of a "ooh, you went the extra step!" if someone has the contacts for it. I don't fret about things like that, mostly because I need actual prescription contacts, and I haven't had the opportunity (or the funds) to find coloured lenses for someone with astigmatism yet.
That said: it all depends on what you like, I think. To me, the hair colour is far more telling than the eyes, but that's just my two cents. (And anyway, wigs are easier. :3 )