Very cool site!!
Well I do like the Enduro, and the comp is a good worthy frame to trick out, same frame as the upper end stuff.
I would first start out with a new set of wheels, get the lightest disc hubs you can afford, Chris King hubs are some of the best and easiest to rebuild. American Classic hubs dont cost as much but are even lighter, check out there web sight, wheels as low as 1400 grams. My CK/Mavic 317 wheelset is about 1624 grams, if money is a problem then just get some new XT hubs and lace them to 317 rims with double butted spokes and aluminum nipples, they weigh only 224 grams more than the King wheels. 1846 grams
Wheels will not only lighten the bike but also improve the ride.
Stans notubes and some tire's like WTB Mutanoraptors, this might lighten the load about 2 pounds! Price will be anywhere from 200 to over $600.
Next I would replace those forks with a Fox Float, then perhaps get a Thompson post and a WTB Laser seat.