I would go with the truvativ hussefelt cranks and a gigapipe DH BB. I would also go with avid BB7 mech brakes, rather than hayes. 8" rotors are most likely going to be overkill unless you're 350+ lb. The stem and handlebars, I would forget. The fork, I'd almost forget. I'd just upgrade the springs and figure out if you want a nice fork with a 20mm t/a or a rigid fork. Deore XT drivetrain components aren't really worth the upgrade. I'd stay LX

Wheels eh? How much do you weigh?