The ecs flywheel is apparently a full custom job its not based on any flywheel from the vag range and i dont think the 1Z flywheel can be modded to the same spec, the rs4 clutch is ideal but then ive heard the ecs flywheel isn't the best bit of kit, the rs4 friction disc is similar to the S4 V8 one i have with the LT plate rated to about 350 torque iirc
I dont think 350-400$ will be right i got the frankenturbo kit for $1100 and it was around £180 import duties and tax so brought the kit in at around £950 delivered !!