Alclad is the best, hands down. You use a gloss black primer and spray LIGHTLY over that. Too much paint dulls the effect. You can buff it to a high shine after that. Alclad has a black paint to use under it, but you can use almost any gloss. I use Tamiya Gloss Black and it seems to work ok if you get a good gloss on the Black.
Don't forget, you can always look into using Bare Metal Foil for different chrome applications too?