ive built sevral turbo kits, best way to figure out piping is pretty much do it last. get your manifold and turbo and intercooler and do a test fit then visualize it in your head to see what bends you will need. then order the bends from http://www.mandrel-bends.com/catalog/
i dont know what brand turbo or wastegate come with that spa kit so i cant say if that was a good price or not.. ive always found its better to piece together my own turbo kits starting with a manifold and a turbo i picked and pick the rest of the parts by hand. as long as you can find affordable engine managment.