Here is what TireRack has listed for the 04 Crossfire. Any way you look at it, it is gonna be a bit pricy considering the sizes of the tires. 18's and 19's aren't all that cheap.

Goodyear Eagle F1 All Season

Fronts: $141 each
Rears: $240 each


Michelin Pilot Sport A/S Plus

Fronts: $201 each
Rears: $269 each


Yokohama ADVAN S.4.

Fronts: $192 each
Rears: $261 each


And if you just want all season touring tires here is your choice.

Continental ContiTouringContact CW95

Fronts: $165 each
Rears: $253 each