To truly step up you need to get two lenses.
Unless most of your 18-70 photos are in the 18-28 range, I'd invest in the nikon 28-70/2.8, probably nikon's sharpest zoom lens. You think your 18-70 is sharp, it's a joke compared to this lens.
If you can't live without the wide end, go with the nikon 17-35/2.8, it's almost as sharp as the 28-70, and is a lot of "fun" - you can physically get very close to your subject which is pretty interesting at 17mm.
Both lenses are fast and very sharp, even wide open. Of course, you get what you pay for, empasis on PAY. But hey, you said you were looking for an upgrade. Consider how much upgrading your car would cost, then your lens investment will seem paltry in comparison. I'd rather drive my old beater and use top-quality nikon glass, personally
chris schmauch
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art director ~ photographer
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http://www.goodeyephotography.com ~
http://goodeye.smugmug.com
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[hardware: dee.two-hundred + dee.seventy]