Actually, Buck uses 420HC stainless, with a propriety heat treat overseen by Paul Bos. Buck brings 420HC up to its full potential. Based on my (and many other's) experience(s) with Buck's knives, they most definitely do NOT suck. To the contrary, knives like the 102, 103, 105, 110, and 119, to mention but a few, are some of the best deals in the knife world. Give one a try and you most likely won't be dissapointed.
To the OP: Entrek is one company that is rarely mentioned here, but most of their knives are within your price range, and are made from 440C stainless (MUCH better than 440A or 440B). SMKW is one site with a good reputation that sells Entreks, but they can be had for less money elsewhere.
Edit: Entrek knives come with kydex sheaths.