The buck 110 cabelas alaskan guide in S30v stainless is a good one.
Check out the Spyderco Stretch lightweight in the ZDP-189 stainless-it will seroiusly hold an edge around 3 to 4 times longer than those old bucks in 420 stainless.
These new PM steels (powder metalurgy) like s30v,zdp-189,cpm m4 ect. have easily noticable edge holding superiority.
The premium steels for folders in years past (ats-34,154 cm, D2) were a little better edge holders than 420,440c but not worth the increased cost. Not so with the new premium steels.
As for the replaceable blade knives IMO they have less and less appeal also, why carry these weak folders and their spare blades around.
