I'm not sure, but have you thought about where your money is going?
It WOULD be nice i'm sure to have an 06' si, but if you're only having enough money to buy the car alone, I'd wait a little while, not only will it lose value as you leave the lot, but it will be bone stock. I'd buy a bit older of a civic or wait a rough year when they're not as hot in the market but still hot among tuners.

Unless you have the money or don't care, then by all means go ahead, but an si with decent equipment alone is around $21,000