(1.) Vantage Force series pocket knives. I think they pulled these to push the relaunched Paradigm series. However, I love the stronger (and swedged!) blade profile, as well as the stronger handle construction. Thought about getting the normal 420HC version when it was available as a backup to my VFP, but the funds just weren't there at the time. The simplicity of its construction and its lack of springs (I find such things a bit spooky to stick into a pocket) were and are wonderful. A few pretentious dudes have complained about the Vantage, but for those who are not afraid to void the warranty by opening it up and cleaning it (it's only voided if you get caught!

) - and putting it back together correctly, of course - it's a delightful tool. I do think it might make a comeback one of these days, seeing as the "normal" Vantage is still available.
(2.) Ground Combat Knives. Pictures failed these. I did not want one initially, but after watching a few reviews and being under the threat of their sudden discontinuation, I jumped to get them. The spearpoint version is superior in my opinion. While not a perfect knife, it still an
outstanding knife! Buck's tactical knives are not large in number on the market today, and I wonder if they'll ever make a comeback as a whole. If a new knife comes out with the lessons learned from the GCK, I am certain it will be a winner!
*edit*
(3.) Probably should tack this one on here, too - Buck Kalinga Pro. Probably one of the most beautiful knives I've ever seen or handled. Not really suited to anything other than processing meat and hide, it's limited by its specialization. But... for when that day comes that I go out into the field and harvest game... I don't think there's a better knife for the task. Its only shortcoming is that it lacks a leather patch covering the snap on the
inside of the scabbard (It can do a number on the bloster / guard if you don't catch it in time!). On the bright side, it's something my local leather guy fixed last weekend, so that's that!