I have been married to my tamron 28-300 lens - I purchased it for my D50 (body only) a few years ago. I just treated myself to the D90 and the kit lens (18-55) sat lonely for a while. So I decided to uses both cameras and lenses on a recent trip and discovered I really liked the 18-55 for tighter spots,and the clarity is great. I also have a 105 Signa Macro and even though it is a little slow to focus, the results are great. I have enlarged photos from each of these (lenses and cameras) up to 12 x 18, and have not been disappointed. Actually, in a few instances, the 18-55 images were sharper.
Bottom line, buy the best you can afford,and experiment. That is not to say you won't want to upgrade later - but maybe not. And Have Fun!
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