Some paint questions for the guys who know paint

I know how to paint,I was just saying I am no expert....I know alot of guys say to stay away from single stage because its hard to match in the event of a screw up.....but the hole point of a nice point job is to avoid screw ups.....if your painting in the right conditions and with the right equipment and you have the knowledge...then no reason it cant be pulled off....5 coats is a little more then I am talking about going....I was thinking more along the line of 3 coats on top of a grey prime.....should give me the right depth to the purple I am looking for. P.S....this brand of paint is summit and it is buffable single stage metallic.....its fine partical,not metal flake. I will probably end up going with the single stage purple and then adding the clear on top anyhow.....thanks to those of you who answered any of my questions