Well I got these XTR's for insanely cheap! They are 170mm, which lowers the chance of flex and with the shorter cranks I am running a slightly easier gear (40/15). Saints are stiff as heck, but make for a terrible chain line(I tried them).
I was afraid these cranks might be flexy as heck but they are incredibly stiff! The BB of the frame deflects before the cranks flex. I'm very happy with this set-up at the moment but time will tell if it was a good choice.
Parts spec.
Frame: Formula Nucleus Pro XL
Fork: Answer Scythe Pro
Wheels: Chris King Hubs (15t cog), Bombshell rims, DT spokes, and Alloy nipples
Cranks: Shimano XTR 170mm 40T e13 Guide Ring
BB: XTR with Ceramic Bearings
Brakes: Shimano XT M760
Seatpost: Thomson Elite
Headset: Chris King (Rasta)
Tires: Intense Micro Nobbies 1.5R/1.75F
Tubes: UltraLite Latex
Pedals: Time Carbon/Titanium
Saddle: Selle Italia SLR Carbon/Titanium (135g)
Stem: Danger Boy AK47
Bars: Fly "Mike Day Signature"
Grips: Dirty Lock-ons (White)
Brake Housing/Cable: JagWire Teflon coated
I was afraid these cranks might be flexy as heck but they are incredibly stiff! The BB of the frame deflects before the cranks flex. I'm very happy with this set-up at the moment but time will tell if it was a good choice.