The Scallion. I bought it in the summer of 2002 and have been buying Kershaws ever since.
I've been in to knives since I was about 10. I got my first Swiss Army knife and that kicked of my habit. Before I bought Scallion, I knew very little about quality knives. I had owned several Buck, Schrade, and Gerber knives and had an ever expanding array of SAKs. In June 02, I went to a local sporting good store and was browsing. I had read about Ken Onion's speedsafe designs, but didn't really know anything about Kershaw. I was about to buy a Spyderco Dragonfly (I had already taken the clamshell off the rack) when I spotted the Scallion on the rack next to it. I like the lines of the Scallion better and thought I wouldn't mind trying out this new "assisted opening" feature I'd read about, so I put the Dragonfly down and picked up the Scallion. And I've never looked back.
I did eventually buy a Spyderco (quite a few of them actually) and I've also owned several Benchmades. I've sold most of them over the years though. My Kershaws are the one brand I've never been able to sell. I've given 2 Scallions, a Chive, a Blackout, an aluminum Leek, and a mini Mojo, and a well worn Avalanche as gifts to friends over the years. After 10 years of collecting and carrying Kershaw, I can honestly say they'll always be my favorites; although, I continue collecting SAKs alongside them..