Not too far off. It's already got adjustable Tokicos up front and Konis out back, with an ST front swaybar, and factory strut bracing. I'm going to run it with the stock springs at the tire rack course this weekend, and then we'll see what it needs rate-wise.
There are quite a few track guys who use the stock springs.
I would think on a car like that the stock springs are pretty good. Could go coil overs and have the ability to change spring rates, but that might be a bit hardcore for what you are going for.
I love those rims, i put them on every car i have in Forza. What they lack in all out style them make up for in coolness for being light. You sir are a breath of fresh air with all these 400lbs chrome DUBS out there.