Current upgrades are as follows, SRAM X.0 grip shifts, SRAM X.0 rear derailleur, Shimano XTR front derailleur, Sun Ryno Lite XL rims, wheelsmith stainless spokes, XT 756 disc hubs front and rear, SRAM PG990 9SP rear cassette, SRAM PC-991 9SP chain. The old BB had a shitty heavy steel 122mm square taper spindle, I want to upgrade to an ISIS setup with a new crank as well. I have a 68mm shell and I've been trying to determine the best crank/BB setup to go with to complement the rear drivetrain. I like what I've seen from Race Face and Truvativ, but I am unsure as to what components work well together. I am leaning towards the internal bearing setup and want to keep the BB and crank assembly under 200$ if possible. Thanks for the help in advance.