If you are a beginner, I would steer clear of a driver, and get a bigger headed 3 wood with 15° or more loft. If you insist on getting a driver, get one with 12° loft or more.

If you are not a beginner, get what ever suits your swing. Try a few out, and see what you hit best, but remember when trying that it is not your best hits that you should count, but your worst. It is no good buying a driver where 1 in 10 is a screamer, and the other 9 are terrible, if there is one which is more consistent, even if it is shorter.