Caramel, caramel, and then some more caramel. If it comes wrapped in milk chocolate, so much the better.
I'm also fond of these, it's always a real hit of nostalgia for me when I eat some:
http://en.wikipedia.org/wiki/SweeTarts
I think I prefer the chewy version over the hard candy version. There are some other sweet/sour things like that, Spree and... I can't remember the name of the one that's *really* sour and tangy.
Possibly my favorite, if only because I don't get them that often, are these:
http://www.goetzecandy.com/caramel-creams