I don't really like the JDM badges, but it depends on the car. I recommend exhaust, a drop, CAI, nice rims. I have black Motegi FF7s, which aren't bad, I just wish I'd gotten 18s, but being a college kid it was easier to get rims that fit the stock tires. Once I get money I'm switching. But yeah, catback and CAI are the way to go for sound, but I prefer performance. If I had the money I would've gotten an SI, but insurance and price is just way too high for me.
But yeah, go with what you think looks and sounds good.