[pm90]

You should really read patio11's article on it, but the short of it is that, yes, you should always ask for more. The simple reason being that they won't rescind your offer but might give you more, since they planned a salary range for that position.

[dtemp]

Especially if you ask for a little more. I had friend once who asked for a lot more and they rescinded the offer; because they (probably rightly) figured the two wouldn't have a long relationship together if it's starting like this.