If you're looking for a reasonably priced, high performance butterfly knife, you'll want to consider a McAhron Custom Balisong.
The McAhron "Tokyo Special Tanto" butterfly knife has a Bob Lum inspired design with a sharper point. The handles are bolstered titanium with red G-10 scales. The pivots have silicon bronze washers and stainless bushings that perform well and keep handle play to a minimum. The Tokyo Special Tanto is a latchless balisong.