Nissan240SX,
Any good autocolor shop should have paint books with chip samples... when I've repainted my car I've just gone through those books until I've found something I liked. The last car I painted went to the somewhat popular Dodge Viper GTS Blue Pearlcoat (PBE) That paint is absolutely stunning! As of now I am rocking factory Silver Moss (KR5) on my stock 98 SE. Looks great! Plus as a bonus your car is the same color as dirt so you can delay about a month between washings and still look okay!
Good luck man!