Hmmm... wow, you sound like a super newbie, gymmie. :bsmilie: No offence, but how to recommend lenses just like off-handedly that without knowing your photo style?
Allow me this analogy: "I just started driving recently. Was thinking of getting another set of wheels, any recommendations?"
I am just using this as an illustration. It all boils down to the driving style of the driver, how responsive you want your steering to be, how much road-holding you want your tyres to have, how fast an acceleration your want your engines to churn out.
Same for photography too. Give your camera a good run-in for 1000km. Then I am sure you will know what comes next.