Yeah. I'm not seeing a whole lot of reason why NOT to do it, unless you have some fascination with doing something outside of what they offer, or doing something "custom".
Personally, having done a build myself, I have no desire to do a "small" motor and a "big" turbo; that's not what personally appealed to me. However, if gifted 30 thousand American dollars, I'm sure I could have called up AMS and had them do a 2.5L FP Black build as well. Don't look at the AMS 900x package as the only option out there, they can do whatever the hell you want.