I like my nachos with some kind of chili con carne, cheese and salsa. If it's missing any one of these things it's not proper nachos, although I'll settle for a strongly flavoured minced beef instead of chili con carne. Anything above and beyond those things isn't really needed for me - it just takes away from the glorious flavour. Particularly sour cream and guacamole, which unfortunately I can't stand on nachos (or on anything, for that matter). Jalapenos I find to be a touch too strong, although obviously it depends on the jalapeno. I can eat them, but for me they just take away too much of the flavour of the rest of the meal.