Get a Mora Robust or Companion for the fixed blade and buy a good quality folder. IMHO, a folder needs better materials and machining to lock up tight and stay locked in use.
Many use the Gerber LST or similar. They are light because they have no metal liners in the handle, as well as a fairly thin blade. I have a Benchmade Mini Pika with similar construction, although it has a thicker blade and is 2oz. I carry the Pika daily, but my "serious" hiking knife is a Benchmade Griptilian. You could split the difference and get a Mini Griptilian. The Griptilians are strong and very ambidextrous and they have some of the best steel. You can open and close them with a flick by pulling back on the lock rather than using the thumb stud.
I like the 111mm Victorinox Trekker one-hand opening knives with a saw too. They aren't very expensive, although they do start to add ounces with the other tools. I would love to see them make one with the one-hand blade, saw, awl and *scissors*. I think that would make a perfect hiker's knife. In lieu of having scissors, I like to add a Victorinox Classic.
It has been said that the best survival knife is the one that you have with you, and a folder is always there, clipped in your pocket.
Moras are an excellent way to get into fixed blade knives. You can get a good one for $15 or so, or you can go for broke and get one of the new ones with a firesteel stowed in the handle for $28-$30. They are easy to keep sharp and will take all kinds of abuse.
If you want a fixed blade just for food prep, get one of the Victorinox Little Vickies. It weighs an ounce with the sheath and costs $10. It will cut cheese or apples with wild abandon and you can clean a trout with one and do a good job of it.
My $0.02 :)