I think there are many blade in BKC that fit "inexpensive worker folder over 3.5-inch blade" category.
Also, keep in mind that if there are choice between 4-inch blade with full liner vs capsuled (Like Grip, 94X, etc) liner, wich one would you chose?
I will chose full liner, and I own Rift, Adamas, Contego, and 710.