Need your suggestions for a lens

eyeguy

I will be purchasing a Nikon D90 with the kit lens soon and am looking at getting a better lens. This is were I need your help and suggestions. I will be shooting portraits of Families, kids, babies, and will be working towards sooting some weddings. I will also be doing some Travel photography and general shooting.

I am looking at getting some kind of fast glass to do all this but don’t wont to spend foolishly,

Thanks for your suggestions