Got any tips to end car buying itch?

JerseyFrank thought this was worth mentioning said

I've got a 13 year old pickup truck and I keep eyeing up the Chevy SS. The $45,000 price tag keeps me from scratching the itch; however, the Pontiac G8 GT is the same car. There's a 2009 with 40k miles at half the price. I want it badly. I can "afford" it, but I don't need it.

How do I stop that desire?