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A 4.10 diff would be first on my list. Tires wear out, and 19" wheels don't have enough sidewall IMHO. I've busted 2 of the stock 18's on my old 3.0i (255/35/18 tires) on potholes, so it depends on where you live. Plus replacement tires are more expensive with 19's. If you tear up a wheel on a bad bump/debris, you'll pay a premium to replace it. So, if you've got the disposable income wheels look nice. If you're wanting a single mod, a diff will make the biggest performance difference.
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