Well, if this is your first venture into mining I would advise you to start small, build 1 rig and learn the process, after it's running 100% stable for a week build the next one, etc.... 8 at once may be difficult at first.
thats a big problem since i need to wait so much for the parts,becouse of the order process.im from bosnia and all the parts im buying are at germany 2000KM ride,since that thing i also cant min/max the price,since i need to order the things that are specific in that store.