This is a difficult question to help you answer without knowing a few more specifics. Mainly what edition of D&D are you playing, and what type of a character do you envision yourself playing? What kind of a gamer are you: do you want to specialize in one thing and do really well at that, or would you prefer a more diverse range of skills that help you in a broader sense? :)

Races and classes are there to either augment one another or provide great opportunities for role-playing a character that isn't min-maxed all to heck. What kind of contribution would you like to make to your party? Knowing that will go a long way towards narrowing down your options. :)