if you already scheduled to get send off your car to the paintbooth next week, shouldn't you have atleast talked to the shop/painted about your color suggestions? makes it much easier for them to get the supplies.
imo, i like to go down to car dealerships to check out what hues of red they got on cars. car manufacturers these days have some awesome color selections. i like the color selections from lexus, infiniti, scion, toyota, nissan, and mazda to name a few.