I plan on running about 550hp in my new engine, looking through rotaing assemblies, is there a major difference in quality in a full forged Compstar vs Forged Scat vs a Forged Eagle Kit?

I noticed about a $300 difference between the Compstar and the other two

 

Eagle has the best set I have eagle cranks in all my motors

 

The callies stuff is above and beyond the other two listed.

However, some machine shops like one brand over another. Talk to the machine shop that is doing the work and see what they recommend, they may prefer one brand over another, but I've seen less variance and better quality time and time again from callies