Hey there
I'd have to agree with the poster above, Ferrari tend toward the 5 split-spoke look. But really, it's your concept, right? I'd suggest you look at the aftermarket parts from Germany and Italy. Really though, it's up to you, it's your concept and the most important thing is that the wheels fit the curves and cuts of the car itself.
We've all seen terrible wheels on pretty cars. I guess it's just a matter of taste. If there's any rim I'd put on an F430 it'd be this:
http://67.15.62.77/_gallery/_TN/0008...00-5157_TN.jpg
I believe these came off the latest LP560-4 that's been running at the carshows, but I think it's exquisite. Again though, just trust yourself