Yeah, I'll prob make a jump to 180. I'm still trying to get a feel for the XT's

 203 front 180 rear!!! Shock & fork look killer! Both familiar and killer! Ride report!?

 You don't need a 203 front. 180 front, 160 rear.

 Meh..U no ride steep! Never skimp on braking!

 I ride plenty steep, but my brakes actually work how they're supposed to.

 So they only make the larger rotors to scare the weight weenises off? Think not! They make a great difference on longer steep runs, in performance and cooling! If you are building a light xc bike sure, save the weight! If you are riding an enduro bike like it should be, 180/203 is where its at!

 Larger rotors are great for DH. You don't need a 203 for enduro. If your brakes work then you shouldn't need anything bigger than a 180 in the front.

 Ride report: this thing is a hell of a lot of fun. Agile, plush, whippy, but incredibly stiff all at once. I found the rear end was a bit saggy so I added some air to the CCDB (145 psi) and it turned into some kind of wicked hard tail hybrid, stiff as a board on rolling, flowy trails but totally responsive on steeps. I'm starting to get a feel for the bike and getting more confident launching it. it's an amazing climber and a great platform. I really couldn't be happier, anxious to try the 1x10 setup.

One small error I made was buying a 175 crankset, I think a 170 would have been preferable with the lower BB.

I will likely go up to the 180 front and then re-assess. I'm currently about 180 lbs so it should do fine. Thanks for all the comments, I take any and all advice to heart.

 I weigh 185 lbs without gear and I do a 160 rear 180 front rotor setup. I also run 170mm cranks even though I could run 175s since I am 5'11" tall.

 Merci bonhomme!!