There are a lot of light-weight options. You might even look to "trail-runners" These are kind of like a sneaker but more durable for the rougher terrain of the trail.
I bought my last pair of mid-weight boots at Sierra Trading post. I would start their. Find a boot/shoe you like. Look elsewhere on the web for reviews on the shoe and purchase accordingly. You can probably get a good shoe here for about half of retail cost.
Don't buy anything that looks like a work boot (heavy) or that calls itself a technical boot (ice/snow climbing)
