I make brittle sometimes and usually put pecans in it, instead of peanuts.
Super easy to make, just heat up some sugar with a little salt. Then add a bit of vanilla if you want. It has to get really scary hot and turn a little brown, then just pour it over your nuts on a flat sheet, carefully, and let it cool.
For something commercially available, I'll go with any dark chocolate.
Sometimes I buy a bag of dark, semi sweet chocolate chips intended for making cookies and just munch on them straight out of the bag.
My favorites are made by Ghirardelli.
I also melt down almond bark and make little balls, then roll them in crushed pecan powder. Pain in the ass, because I like more pecan flavor than almond bark. I have to make them small to get the balance just right.
My wife is the real confectioner, though. She makes fudge, divinity, truffles and something super rich and sweet, "loaded with toothaches" that she calls "chewy gooeys."