In that $50 price range, your best overall buys are:
1. Spyderco Delica (3 inches, G-10 blade steel), or
2. Benchmade Mini-Griptilian (2.9 inches, 440C blade steel)
The Kershaw Ken Onions definitely have cooler styling and "wow" factors. However, their steels (420, 440A) are a bit softer and a cut below Spyderco's and Benchmade's, though very adequate for everday use. You'll just need to sharpen them more often. The Kershaw Leek (3 inches) is the coolest, but I found Kershaw's "assisted opening" tricky to use under "all thumbs" stress (i.e., a self-defense scenario), especially their small Chive and Scallion. That opening system IS fun to play with, although I've heard of guys wearing out their Kershaw Onions this way. However, Kershaw does have good customer (repair) service.
Bear in mind that the "assisted openers" are marginally legal in certain jurisdictions, and poorly-informed cops have been known to confiscate them as "switchblades."
FWIW, Kershaw (based in Oregon, like Benchmade) is owned by a Japanese co., but their stuff's mostly made here. Spyderco's in Colorado, but most Spydies are made in Japan.
Unless you live/work in places populated (regrettably) by politically-correct, weapons-averse Sheeple ("Eeeuuww, whatya need THAT nasty-looking knife for?", "This is a weapons-free zone. Zero tolerance", blah-blah, etc.) all these should be socially acceptable. The Delica's aggressive point might scare pacifist grass-eaters, while the colorful variants of the Kershaw Onions may elicit "How cute!" responses from ditzy babes (whose crime-victim-in-waiting Weapons IQs are equal to a dooknob's).
The Delica's steel is the best (followed by the Griptilian) and it's been a time-tested best-seller. Benchmade has the best lock-up system and seems to generate the strongest owner loyalty, followed by Spyderco. All 3 manufacturers have helpful "user forum" websites where you can gather honest opinions by actual owner/users.
Try 'em all. Like flashlights, you'll never be happy with just one. The more you know, the more you'll want.