Consider two things (besides fit) when looking for shoes.
While lightweight is definitely good, it's not the bottom line. Otherwise, we would all be wearing only socks while hiking.
What are the conditions of the trails where you hike? Are they flat and smooth or are they mountainous and rocky? I hike mostly in the mountains of New England where some of the roughest trails I've ever seen are located. I personally need a shoe with some substance for both support and protection there. However, socks alone are fine on my carpetted bedroom floor!
What condition are your feet in? Do you work outside and hike every weekend and take a longer trek 3 or 4 times a year? Or, do you sit behind a desk 5 days a week (while dreaming about hiking) and only occasionally get away from family and other responsibilities on the weekends to hike? The answer to the above will tell you how well your feet and ankle muscle structure is adapted to hiking and indicate how much support and protection you may need.
Unfortunately, I fit closer to the dreamer behind the desk but when I do get out, it's to rugged trails. So, for my personal situation, I have found that Montrail Hardrocks, with Green Superfeet insoles, work best for me. They are somewhat lightweight while being substantial enough for me.