I've had a handful of the highest rated lightweight boots at my house for several months now, and I finally got around to putting out the video summary of my thoughts. I ramble more than I should have but maybe some of you might find some use in this-

https://youtu.be/XHLbByBB32Y

The clear winner for me was the Lowa Techlight hunter - but it's not as "lightweight" as was claimed or as they report, but it is excellent. It's still a pretty heavy boot, but you get more for that weight than with other boots.

A couple of other favorites - The Salomon GTX 4d and the Asolo Neutron. Both help cut the weight and perform very well. You can pick up the Asolo from STP these days for anywhere from 100-150, depending on the coupon you use. That's a great deal.