If lightweight is your goal, I can share what I've done for a walk about camera.
I normally use metal, ie. Sinar F & P, and a Calumet C-1. But for hiking I use a N-2 Chamonix with an older 135 Fuji W (seiko varient-tiny tiny) and a Fuji 240 A. In a rucksack, I can load camera, lenses, holders, dark cloth (black magic), filters and be good to go at around 15-16 lbs. i can add a 90 to the mix and add a pound or so. A light carbon tripod finishes the kit. After what I carried before it feel like a feather.
The Fuji 240, might break the bank for you, but it is light, sharp and will cover 8x10. Start with one lens and add as funds become available. Using a one lens kit will make you a better photographer anyway as you start in LF.