I could list plenty of knives here, KDs, Shigs, Kato, DT, Watanabe, Kochi, some are simple but awesome, some are simply awesome, some are both, some have been rehandled... But everything has a price.
But from all the knives I own, I could never let go a Wüsthof Dreizack Classic 4582 (200mm). Why? For its performance? Nope. For its geometry? Nope. For its price? No. But for its sentimental value: the knife was given to me when I turned 18 by my mother who has since passed away. Sometimes its not the best performing things, the most beautiful, the most expensive things that you want to keep. And I don't even use it as I prefer the performance of my higher-end knives...