Just off the top of my head, I have gear and clothing from:

Six Moons Designs
Tarptent
Equinox
Gregory
Osprey
LL Bean
GoLite
EMS
Patagonia
Sierra Designs
Marmot
Western Mountaineering
Mountain Hardwear
Outdoor Research
Brunton
Bozeman Mountain Works
New Balance
Salomon
Icebreaker
Ibex
Smartwool
Montbell
Black Diamond
Outdoor Design
Nalgene
Cascade Designs


So, no, I can't say that I have a single favorite manufacturer <g>. I do favor smaller firms, especially those that specialize in lightweight backpacking gear.
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--Ken B