Welcome to the forums, tortfeasor. You're getting a lot of good ideas here. Hope I can contribute also.
First, I'm behind the Spyderco Native FRN and Calypso Jr Ltwt, in that order. The weight might be more than you want, and I usually am pretty well put off by SS handles, but AG Russell has the Spyderco Jess Horn in SS for $50. It is one of the best looking production knives I've seen.
I can't say anything about it's performance, but I really like the shape and "furnishings" of the SOG Sculptura. It has a real round sort of design, like a good skipping rock. It is made from Zytel -- transluscent Zytel, in several different colors, I think. It has a lock controlled by a spring, which, as well as all other inner workings are visible from outside. Gotta get a vote for plain cool, in my book.
Everything is so relative in weight. I always carry at least 2 "full size" knives, so knives like the Native and Calypso Jr already strike me as very light. So, though they may be heavier than you're thinking of, I think you might consider either the Camillus EDC or the Outdoor Edge Paragee. Both are frame locks designed by Darrel Ralph, surely one of the true geniuses of the knife world. At first, I liked the Paragee better, but the EDC is growing on me. Fantastic service from Camillus in another area has earned my wholehearted respect and gratitude.
One more -- almost forgot it. The Spyderco Mouse, marketed by Edge-Tech, which is owned by Tim Wegner, the designer of the Mouse and the incomparable Wegner and Wegner Jr. It's pretty spendy, $90 I think, but truly cool, and a "real" working knife, below that cute surface.
Good luck!