Tony,

You can take a heavy hand to them all. You, of course, will leave some green. All of the leggy parts of the basil can be pinched back to the base leaves. You can easily take 2/3s off the top of the dill and parsley without worry, and it's very hard to do wrong by the oregano.
You'll probably want to add a location and zone to your profile, as should you have gardening questions down the line, that info will prove very useful for anyone who comments.