I have a Trident. They sell them at Walmart now for $49 (serrated). I think it would probably be best for light-medium cutting. I personally carry it for self defense only. I like the deep clip and light weight. The cutter is only for paracord type cutting.
The Kershaw Blur ($55-60)is pretty light and a very rugged knife if you are concerned about safety. I would get plain edge if you are going to make it a user. The cold steel voyagers ($50) are also, light, rugged and within the same (less)price range. The Tenacious($30)is extremly popular among value folder buyers. My Rat 1 folder ($30) is heftier, but extremely rugged.
If you limit yourself to assisted openers you will be missing out on a lot of great folders.
I don't buy Gerbers.