You don't say what kind of robot you want to build, so it's difficult to make a specific recommendation. The Solarbotics link that Steve sent you last week has a section dedicated to beginner's robot kits. Take a look there and see if anything looks appealing.
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so i guess ur experienced in elecronics and mechanics
No, I just have mad Google Fu.
Take a look at some of the robotics kits available in the Maker Shed Store.