Automotive Forums  Where Car Enthusiasts Go to Discuss Cars Online

I'm looking into buying a 2005 Infinity G35X and have seen numerous good deals around, all considerably (3k) below Blue Book. It seems too good to be true. I haven't ran a CarFax report on them yet, I was just more or less curious:

Is it a good time to buy a car?

I wouldn't be able to put much down and would prefer waiting until closer to winter, when I will actually need the AWD.

So what should I do? Buy the car and finance more now and save on the sticker price of the car, or wait until Fall and can afford a larger down payment?