I have knives from Buck, Coldsteel and Benchmade. But there are many good makers in prices ranging from ~$40 to as much as you can imagine (and likely more). If Buck, I recommend WalMart. They sell Buck knives for far less than anywhere I've seen, including on the internet. Most places sell the Buck Special Mod. 119 for about $50-70. WalMart sells them for about $40. Of course for strictly backpacking and shaving weight, I might go with a smaller blade. Benchmade ranks their knives into classes - Red, Blue, Gold & Black. Red is the lower priced, but decent quality. I'd liekly look there as several are a bare blade blank with a thin handle mounted and a good light weight molded sheath.
Something like these two:
http://www.benchmade.com/products/10510http://www.benchmade.com/products/10536In fact, I own the Benchmade Fecas Gamer. 3.58 Oz.
This one would be a little easier on the hands if real leverage were needed for something:
http://www.benchmade.com/products/10505I don't own it, but do own a very similar knife from Buck. This one is almost 2x the weight of the first one and 3x the 2nd.
The major adv. in a fixed blade is there is no chance of the blade closing on your fingers in a place where help is simply not available.