You do not want to tighten up your suspension too much with out upgrading to sticker tires. If you have a really tight suspension and only average tires, your handling will be worse.
The force that would have gone to body roll instead is transferred directly to your tires as lateral force. Meaning that it will be easier for you to slide. In coniditions such as rain, this means that you are much worse off than with a stock suspension.
Just something to think about as you are trying to decide what suspension components to get.