I am versatile in my delivery: I air spots (commercials) regularly as I report news and traffic for LA-area radio stations. I voice commercials, not related to traffic or news, for other outlets, too. I also voice newspaper articles, and wire service stories, which require yet another approach. This is clear, measured, yet authoritative style.
Yet another voice approach is the voicing of long-form instructional business documents, which I have done over the last six months. It's an authoritative style, too, but you have to imagine you're in front of a meeting of business people, who are learning, say, new marketing or sales techniques and strategies, and convey a smooth sense of friendliness, with a knowledge that you need to get to the point quickly.
I would also like to do voiceovers for documentaries. I have done them in the past, but not recently.