I think much of it depends on the legality & where you're going to carry it. If you're looking for pocket FB carry, than the Izula & similar sized knives are probably at the top end, sizewise, that you can go. If you'll carry it OWB, then it doesn't matter.
An EDC FB's advantage is strength & simplicity, but if pocket carried, the downside is it'll have a relatively small blade.
Personally, I EDC a HAK, along with a folder. The blade's only 1.5" of S30V, but many very concealable FBs don't provide much more.
Other small FBs of consideration:
Becker BK11: Handle's small & uncomfortable for larger hands.
Emerson La Griffe: One of the best for a concealable, SD type small knife.
HideAwayKnife: IMHO, the best of the small ones, but pricier.
Boker also makes several different models off of some known makers designs. I think most of them are in 440C, so they also have decent blade steel.
Michael Morris (Goes by "mykulmorriss" on here) makes some excellent, reasonably priced small FBs (Using files, I believe) & with well made & thought out sheaths, too (Kydex or leather, IIRC). He's definitely worth a look, too, although he'll be more than your $50 price point, but not much more. I think his knives start at $65 or so?