I'm not the greatest on components, my bike came set up very nicely (bought it lightly used, cherry condition, from an Xterra racer who owns a bike shop, she didnt' like the fit)
I'd not running discs, and my fork (RS SID ) weighs in almost a pound lighter than anything else out there. My frame is Alu, and I've got carbon ( monkey lights) handlebars, mostly XTR components on the drive train.
There are tradeoffs. the "light" tires wear out really fast. I've trashed two rear wheels with technical riding, using lighter wheel sets.
I keep thinking about a new fork, but I can't bear the thought of adding 1-1.5# with a Marzochhi which is what I really want. Same thing with discs, in my climate they aren't really needed, not a lot of wet/mud so again, the weight weenie in me won't go there for now.
Irulan
2015 Liv Intrigue 2
Pro Mongoose Titanium Singlespeed
2012 Trek Madone 4.6 Compact SRAM