+1 on the Spyderco Delica......I've carried one for several years, even after I was given a Benchmade Mel Pardue Auto as a gift (I now alternate between the 2). It's a quality everyday knife, with a secure locking mechanism, the blade holds an edge quite well, and it's light enough to not feel cumbersome.
Another option would be the non-auto Benchmade Mel Pardue with the liner lock instead of the auto. I've got one of those also, and it's very comparable to the Delica, although it may be over your $50 limit by 15 or 20 bucks.
Another option would be the non-auto Benchmade Mel Pardue with the liner lock instead of the auto. I've got one of those also, and it's very comparable to the Delica, although it may be over your $50 limit by 15 or 20 bucks.