I have a couple:
1) Spyderco Delica. I traded my Gen 1 Endura for it, after finding the Endura to be too big. This was a Gen 2. I actually liked the integral plastic pocket clip and I never had an issue with the AUS 8 steel not holding an edge. My only real point of comparison was my Swiss army knifes, which didn't hold an edge NEARLY as well. Delicas are not really flippy, nor particularly fast to deploy. They're wide on the pocket too. But There's just something about them. They're just perfect. So thin and light and practical. The only more practical option is a multitool or SAK. How did I break the rule? I sold it even though I loved it. Took it for granted. So last month, I bought another one. $20 more than they were 10 or so years ago, but also with better blade steel, a more grippy grip and a more durable pocket clip.
2) 2 of the same. I have a Victorinox (new) Soldier, but I just had to add a one-handed Trekker, as its scales hold a toothpick and tweezers, which the Soldier lacks, and a plain edge blade.
3) Duplicating category. I have a few ~3" general purpose locking folders, and I try not to duplicate duties, but I'll be darned if 3-3.5" isn't just perfect for a locking folder. I'm finding myself going for knives just because they're a good value, or one is more gentlemanly, or one is better for work, etc. This is the dangerous part, and how a fellow ends up hoarding. After enjoying the Cold Steel Tuff Lite so much, I'm trying to keep myself away from a Pro Lite, which appears to be the larger, more conventionally-shaped blade of the same thing.
4) Buying Chinese. When searching online for a nice flipper with a thin shape, I thought I would like to go for a US-made Kershaw. ...but the one I like the shape of better was a Chinese one. (Chill) I went for it and the quality is excellent. I haven't done enough hard cutting with it to tell if the blade steel is a let down, but I'm not so picky on blade steel, as long as it is decent. On the way, I have an A.G. Russell gentleman's hunter, which is also made in China. I expect great quality from it. Let's see if it can keep up with a Taiwanese-made Cold Steel...
OP - If you like wharncliffes, you should pick up a Cold Steel Tuff Lite. You'll be surprised how good they are. Compared to Spyderco, the lock is more solid (not that it matters) and the grip is better. Fit and finish are on par with Spyderco, and nicer than Benchmade.