I'm afraid I disagree with Ian (unusually
)
I don't see why you have to pick a style of photography and then stick to it. Having a range of focal lengths gives you the opportunity to shoot everything. It also gives you the opportunity to learn.
Ian makes a fair point about lugging round loads of kit and not using half of it but that's only true if you suddenly find you're only shooting wide landscapes or telephoto sports & wildlife. I've been shooting for 3 years now and all I know about what I like to photograph is that I like to shoot anything I can be it landscapes, abstracts, wildlife etc...
Your first SLR teaches you so much. I when I bought mine I'd read every review, every tech spec sheet, every opinion and every hint and tip and I still learnt more from my camera in 1 month than I did from 6 months of reading.