What about rates?
Generally speaking, the less the voice talent is charging, the cheaper the product. You get what you pay for. I've heard some really pathetic voiceovers on Websites and no amount of snazzy graphics could make up for that tinny, hissy, nasal, insincere voice welcoming me to the site. It can get ugly. Remember the person you hire is speaking for your company!
The voice-over talent should have good quality recording equipment, an audio engineering background and a minimum 5 years professional voiceover experience. By professional, I mean they have a National and International client list.
If you want someone to voice a welcome greeting and a few other lines and phrases, then roughly time out the audio and ask for a quote IE: "I need 2 min of audio voiced for my small website, what's your fee?" If you have a large site with a few pages of script and you want to make changes all the time, I'd recommend putting your voice on retainer. For a flat monthly fee, you get virtually unlimited access to a voice.
In summary, look at the experience, get an audition, ask for a quote and compare. Shop around. I think you'll find that you'll want to pay slightly more for someone with more experience.
