I do have a D90 and absolutely love it, i didn't recommend it as the camera and lens would hammer the budget, although in my eyes it would be money very well spend - although i have to say that. I had that kit, but have since upgraded lenses and my dad has knicked the 18-105 off me, which to be fair is a cracking lens and surprisingly sharp for the price.
Agree with Mr A about a fast prime, i have the 35mm f/1.8 and love it, a 50mm will be added to my collection in the near future.
A book which is a pretty much a must for new comers is
Understanding Exposure i think most people on here either own it or have read it.