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I agree with everything said so far, but on the performance side, 19's will NOT offer better performance UNLESS you are comparing equal weight to equal weight.
If you have a 19" wheel that weighs the same as an 18" wheel, then yes there can be performance benefits in "better steering response", less body roll, etc. But if you've increased weight by going to the larger diameter wheel, then all of those gains are more than canceled out by the added weight.
On the street, the only advantage of 19" wheels is looks and you will most likely pay for that in ride harshness.
On the track, you'd only have an advantage if you got some kind of really-expensive lightweight forged wheel, and even then you'd be better off to buy a lightweight 18" wheel instead.
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