i gotta say midnight purple is the best by far (especially at night), but not so great price wise, so i would go for a darker colour (black, gun metal grey, etc) for a 32/33 and for a S2 R33 a lighter colour (silver, white, etc).
with the yellow and green... probly isnt the best choice, you will love it for about a month then you will start sayin... "wtf was i thinkn?", and i agree with WazR32GTSt about the resale... my friend had a yellow supra not long ago and it was pretty tough to sell even with a great price (even though i personally thought the yellow looked great! ).