So I'm taking the plunge and getting an 08 S-works Stumpy! I'M planning on using it more as an XC bike than a trail/ big bump bike. I'm only 145 lbs and ride fairly smooth and race expert 40 +. So what parts would you change out for a better bike in xc, marathon and stage races? I was thinking smaller rotors, maybe mech disks and tubeless? The bike is pretty built out and doesn't seem to need much?