The one on top there. The Ontario Utilitac II.
I'm here to spread the word here. My local knife dealer pressured me into buying it (he's a damn good salesman) when I went to pick up a couple Rat 1's, but gosh darn all I payed was about 30 bucks for it and I'm blown away by it's quality and fit and finish! Perfect blade centering, amazing pivot action (much smoother and faster than the rat) and holy does it feel solid! It's even shaving sharp out of the box! I picked it up with the serrations because one of the guys there had been using it on cardboard non stop and it's still really sharp, so I decided I'd take it. It comes with a strait edge and clip point versions so you don't have to go tanto serrated.
I think this knife may replace the Rat 1 in quality for the money!
Here's a review I found on youtube.
[video=youtube;W2kPcIRjkfw]http://www.youtube.com/watch?v=W2kPcIRjkfw&feature=player_detailpage[/video]