Scott Scale and SRAM XX cranks compatibility

[acmarta]

Dear fellows WW,

I have a Scott Scale 20 frame from 2007 and want to put some SRAM XX cranks in it.

Given it is a relatively old frame, I know I need to use the GXP version of the cranks, but I'm still facing the question of what the proper q-factor is.
SRAM has both the 156mm and 166mm q-factor cranks. Will the 156mm fit my frame or will it rub the chainstays?

In addition, what is the bottom bracket of choice? I read bad things about the Truvativ GXP...

Thanks in advance for your help,
André